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第一篇 Sleepless at Night It was a normal summer night．Humidity(湿气)hung in ...
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被白先勇评价为第一篇台湾中国作家受西方存在主义影响产生的第一篇探讨人类基本存在困境的小说是丛甦的哪部
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RecyclingAroundtheWorld Reeyclingisone0fthebesteNVironmeutal8ucee88stories0ftllelate20theentury．ButwecoulddomoEe．Peoplemustnotseerecyclingasfashionablebutessential． TheJapaneseltreverygoodatrecyclingbecausetheyliveinacrowdedcountryTheydonothavemuchspace．Theydonotwantt0sharetheir1imitedspacewithrubbishButeVeNsoToky0areaaloneisestimatedtohavethreemilliontonsofle~overmbbishatpEesent． In1996tlleunitedStatesleeycledandcomposted制成肥料57millionton80fwaste27％ofthenation’ss801idwaste．Thisis57milliontonsofwastewhichdidnotg0intolaJldfillsandincinerators焚化炉．Indoingt11is7000mbbishcoNectionprogrammesfltndrecyclingcen~e8helpedtlleauthorities． InRockfordacityinⅡIiNOisUSitsoffieialschooseonehouseeachweekandcheckitsgarbage废物．Ifthegarbagedoesnoteontainallnewspapersoraluminium铝earlsthenlheresident0ftllehOUSegetsaprizeofatleast$1000． InJapancertaincitiesgivechildtenweekly8uPPliesoftissuepaperfilldtoiletpaperinexchfillgeforaweeklycollection0fnewspapers． InoneyefllBritainrecycles ．1outofevery3newspapeI’S． ．1out0fevery4glassbotflesandjars罐子． ．1outofevery4itoms0fc10tlling． ．1out0fevery3aluminiumdrinkcans． In1999H0ngKongtmnsported1．3miUiontons0fwastet0mailllfilldChinaforrecycling．Aroand535000tons0fwastewererecycledinHONgKongitselfovethalfthethingswethrowawayconldberecycled．ThatmeansweconldrecycIelOtimesasmuchaswed0now． HoweverrecyclingneedsalotoforganisationaJldspecialequipment．Alsothereisnotmachuseforsomerecycledmaterial． HowmachwastedidtheUSrecyclein1996?
TooLatetoRegretIt WhenIwasajuniorImetasecond-yearstudentinmydepartment.Hewasn’ttallorgood-lookingbuthewasveryniceattractiveandathletic.HehadsomethingthatIadmiredverymuch.Hewasnaturalwarmandsincere. Idisregarded不顾myparents’disapproval.Wewereveryhappytogether.Hepickedmeupfrommydormeverymorningandafterclasswewouldsitalongsidethestreamthatranthroughcampusorsunbathe晒太阳onthelawn.Atnighthewouldwalkmebacktomydorm.Hecamefromapoorfamilybutinordertomakemehappyheborrowedmoneyfromhisfriendtobuypresentsandmealsforme.Ourfellowstudentslookeduptohimasarolemodelandthegirlsenvied妒忌me.Hewasn’talocalbutwantedtostayhereaftergraduation.Ithoughtwehadafuturetogether. HoweverwhenIgotapart-timejobduringthesummervacationpeoplebegangivingmealotofpressuresayingthataprettyintelligentgirllikemeshouldfindabetterguytospendtimewith.Thiswasalsowhatmyfamilythought.HespentthesummerinhishometownsoIwasallbymyself.WhenhegotbackIbeganfindingfaultwithhim.Buthisbigheartandwarmthsoondroveallunpleasantthoughtsaway.HoweverIhadnoideahowbadlyIhadhurthimandthatthingswouldgetworse. Ihadagoodpart-timejoboffcampusthatpaidprettywell.WithmygoodperformanceatschoolIalsogotadmissiontograduateschoolatoneofChina’sbestuniversities.Heontheotherhanddidnotdosowellatschooloratwork.Ihadtoworryabouthislivingexpensesjobandscores. Almostallmycolleaguesandfriendsadvisedmetobreakupwithhim.ThenwehadaquarrellastJune~Hewasingreatpainandmycoldwordsandbadmoodsstartedturninghimaway. Graduationtimewasdrawingnearandhesaidhewantedtogobacktohishometown.Hesaidthathecouldn’tputupwithmeanymore.Iwasshockedandlookedathimindespair. TruelovehappensonlyoncebutIfounditouttoolate. Whoadvisedhertobreakupwithhim?
I'mwotkingwitha{{U}}guy{{/U}}fromLondon．
{{U}}Practically{{/U}}allanimalscommunicateeitherthroughsoundsorthroughsoundlesscodes．
VlbraUngRubberCeHphones VibratingmbberceUphonesCOIlldbethenextbigthinginmobilecommunications．Theyallowwpeopletopressthephonel0IransmitVibrationsaJongwiththeir_____51words．Accordingt0aresearchteamattheMITMediaLabinCambridgeMassachusettstheideawillmake_____52morefun．ManymobilephonescallalreadyVibrateinsteadofringing_____53youd0notwantpeoplet0knowyouaregettingacall．Butthese_____54aret00simpleforsubtle敏感的communication．_____55AngelaChang0fthelab’sTangibleMediaGroup．They’reeitheronoroffshesavs．ButwhenyouholdChang’smbberceHphoneyour6ngersandthumbwl’aparoundfive_____56speakers．TheyVibrate_____57yourskinaround250timespersecond．Beneaththesespeakerssitpressuresensors传感器soyoucantransmitvibrationasweuas_____58it．whenvousqueezewithafingeraVibrationsignalistransmitted_____59yourcallerscorrespondingfingeritsspeed_____60onhOWhardyousqueeze．ChaJlgsayst}latwithinafewminutes0fbeinggiventhephonesstudentswereusingtIlevibrationfea．tureto_____61emphasistowhattheyweresaying．Overtimepeopleevenbegantotransmittheirownkind0fadhoc特别的Morsecodewhichtheywouldrepeatbacktoshowtheywere_____62whatthe0therpel’sonwassaying．ChangtIlinksVibralanguage8couldfunctionforthesame_____63astextingsometimespeoplewantt0comnlunicate_____64withouteveryonenearbyknowingwhatthey’resaying．And_____65actuallybeingablet0shakesomeone’shandwhenyoucloseabusinessdealshesays．
VlbraUngRubberCeHphones VibratingmbberceUphonesCOIlldbethenextbigthinginmobilecommunications．Theyallowwpeopletopressthephonel0IransmitVibrationsaJongwiththeir_____51words．Accordingt0aresearchteamattheMITMediaLabinCambridgeMassachusettstheideawillmake_____52morefun．ManymobilephonescallalreadyVibrateinsteadofringing_____53youd0notwantpeoplet0knowyouaregettingacall．Butthese_____54aret00simpleforsubtle敏感的communication．_____55AngelaChang0fthelab’sTangibleMediaGroup．They’reeitheronoroffshesavs．ButwhenyouholdChang’smbberceHphoneyour6ngersandthumbwl’aparoundfive_____56speakers．TheyVibrate_____57yourskinaround250timespersecond．Beneaththesespeakerssitpressuresensors传感器soyoucantransmitvibrationasweuas_____58it．whenvousqueezewithafingeraVibrationsignalistransmitted_____59yourcallerscorrespondingfingeritsspeed_____60onhOWhardyousqueeze．ChaJlgsayst}latwithinafewminutes0fbeinggiventhephonesstudentswereusingtIlevibrationfea．tureto_____61emphasistowhattheyweresaying．Overtimepeopleevenbegantotransmittheirownkind0fadhoc特别的Morsecodewhichtheywouldrepeatbacktoshowtheywere_____62whatthe0therpel’sonwassaying．ChangtIlinksVibralanguage8couldfunctionforthesame_____63astextingsometimespeoplewantt0comnlunicate_____64withouteveryonenearbyknowingwhatthey’resaying．And_____65actuallybeingablet0shakesomeone’shandwhenyoucloseabusinessdealshesays．
TheClockThatWakeYozfWhenYouAreReady Areyouatealgrump脾气坏的人inthemOITIings?DoyouwakeupeverydayfeelingtiredangryaJldup8etandalltooreadytoflittheSnooze瞌睡button?IfsothenanewalarnlclockCOilldbejustforyou．Thec10ckcalledS1eepSmartmeasuresyoursleepcycleandwaitsforyout0beinyourlightestphaseofsleepbeforewakingyouupItsmakerssaythatshouldensureyouwakeupfeelingrefreshed恢复精力everymoiTling． AsyousleepyoupaSSthroughasequenceofaleepstates—lightsleepdeepsleepandREMsleep快速眼动睡眼一thatrepeatsapproximatelyevery90minutes．ThepointsinthatcycleatwhichyouwakeearaffecthOWyoufeellateraJldmayevenhaveagreaterimpactth．衄hOW10ngorlittleyouhaveslept．Beingwakenedduringalightphasemeansyouaremore1ikelyt0wakeupcheeffulandfull0flifeandinterest． SleepSmartrecordsthedistinctpattern0fbminwavespmdueedduringeachphaseofsleepViaaheadbaJldequippedwithelectrodes电极andamieroprocessor．ThismeasureselectricactiVityoftheweare’sbrainandeommunicateswirelesslywithaclockunitnearthebed．YouprogramtheclockwiththelatesttimeatwhichvouWalltt0bewakenedanditthenatthepIDpertimewakesyouduringthe1astlightsleepphasebeforethat． Theconceptwasinventedbyagroup0fstudentsatBrownUniversl‘tyinRhodeIslandafterafriendcomplained0fwakinguptiredandperformingp00dyonatestAssleep—depriVed剥夺peopleourselveswestartedthinkingofwhatt0doaboutit’’saysEricShashouaarecentcoUegegraduateandnowchiefexecutiveofficer0fAxonSleepResearchLaboratoriesacompanycreatedbythestudentstodeveloptheiridea．Theyhavealmostfinishedaprototypeandplantomarkettheproductbynextyeat Asyousleeptheheadband．
VlbraUngRubberCeHphones VibratingmbberceUphonesCOIlldbethenextbigthinginmobilecommunications．Theyallowwpeopletopressthephonel0IransmitVibrationsaJongwiththeir_____51words．Accordingt0aresearchteamattheMITMediaLabinCambridgeMassachusettstheideawillmake_____52morefun．ManymobilephonescallalreadyVibrateinsteadofringing_____53youd0notwantpeoplet0knowyouaregettingacall．Butthese_____54aret00simpleforsubtle敏感的communication．_____55AngelaChang0fthelab’sTangibleMediaGroup．They’reeitheronoroffshesavs．ButwhenyouholdChang’smbberceHphoneyour6ngersandthumbwl’aparoundfive_____56speakers．TheyVibrate_____57yourskinaround250timespersecond．Beneaththesespeakerssitpressuresensors传感器soyoucantransmitvibrationasweuas_____58it．whenvousqueezewithafingeraVibrationsignalistransmitted_____59yourcallerscorrespondingfingeritsspeed_____60onhOWhardyousqueeze．ChaJlgsayst}latwithinafewminutes0fbeinggiventhephonesstudentswereusingtIlevibrationfea．tureto_____61emphasistowhattheyweresaying．Overtimepeopleevenbegantotransmittheirownkind0fadhoc特别的Morsecodewhichtheywouldrepeatbacktoshowtheywere_____62whatthe0therpel’sonwassaying．ChangtIlinksVibralanguage8couldfunctionforthesame_____63astextingsometimespeoplewantt0comnlunicate_____64withouteveryonenearbyknowingwhatthey’resaying．And_____65actuallybeingablet0shakesomeone’shandwhenyoucloseabusinessdealshesays．
I'dverymuchliketoknowwhatyour{{U}}aim{{/U}}inlifeis
MindThoseManners0ntheSubway SothereyouarejustsittingthereinthesubwayCarenjoyingthatbookyoujustbut_____46Orthepersonsittingnextt0youtakesoutanailclipper指甲刀andbeginscuttinghis0Thernails．AnnoyingMany0fushavetospendsometimeeveryday0npublictransportation_____47Sotomakethetripmorepleasant．wesuggestthefollowingLetpassengersgetoffthebus0TsubwayCarbeforeyoucanget0n_____48StandawayfromthedoorswhentheyareclosingDon’ttalkloudlyonabusoTsubway．Chattingloudlywithyourfriendscanbeannoyingt0others_____49Don’tthinkyourbagsandsuitcases手提箱deserveaseat0ftheirown．Useatissuewheneveryoucough0rsneeze打喷嚏．Anuncoveredsneezecanspreadgerms细菌especiallyincrowdedplaces．Don’tcutyournails0rpickyournoseonpublictransportation．Don’treadoverotherpeople’sshoulder_____50Itcanmakepeopleuncomfortable．Theymightthinkyou’retoostingy小气的event0buyanewspaper．0rtheymightthinkyou’rejudgingtheirbehavior．
TheClockThatWakeYozfWhenYouAreReady Areyouatealgrump脾气坏的人inthemOITIings?DoyouwakeupeverydayfeelingtiredangryaJldup8etandalltooreadytoflittheSnooze瞌睡button?IfsothenanewalarnlclockCOilldbejustforyou．Thec10ckcalledS1eepSmartmeasuresyoursleepcycleandwaitsforyout0beinyourlightestphaseofsleepbeforewakingyouupItsmakerssaythatshouldensureyouwakeupfeelingrefreshed恢复精力everymoiTling． AsyousleepyoupaSSthroughasequenceofaleepstates—lightsleepdeepsleepandREMsleep快速眼动睡眼一thatrepeatsapproximatelyevery90minutes．ThepointsinthatcycleatwhichyouwakeearaffecthOWyoufeellateraJldmayevenhaveagreaterimpactth．衄hOW10ngorlittleyouhaveslept．Beingwakenedduringalightphasemeansyouaremore1ikelyt0wakeupcheeffulandfull0flifeandinterest． SleepSmartrecordsthedistinctpattern0fbminwavespmdueedduringeachphaseofsleepViaaheadbaJldequippedwithelectrodes电极andamieroprocessor．ThismeasureselectricactiVityoftheweare’sbrainandeommunicateswirelesslywithaclockunitnearthebed．YouprogramtheclockwiththelatesttimeatwhichvouWalltt0bewakenedanditthenatthepIDpertimewakesyouduringthe1astlightsleepphasebeforethat． Theconceptwasinventedbyagroup0fstudentsatBrownUniversl‘tyinRhodeIslandafterafriendcomplained0fwakinguptiredandperformingp00dyonatestAssleep—depriVed剥夺peopleourselveswestartedthinkingofwhatt0doaboutit’’saysEricShashouaarecentcoUegegraduateandnowchiefexecutiveofficer0fAxonSleepResearchLaboratoriesacompanycreatedbythestudentstodeveloptheiridea．Theyhavealmostfinishedaprototypeandplantomarkettheproductbynextyeat Theideaofmakingsuehaclockwasdevelopedbyagroupof．
Wouldyouplease{{U}}call{{/U}}myhusbandaSsoonaspossible?
VlbraUngRubberCeHphones VibratingmbberceUphonesCOIlldbethenextbigthinginmobilecommunications．Theyallowwpeopletopressthephonel0IransmitVibrationsaJongwiththeir_____51words．Accordingt0aresearchteamattheMITMediaLabinCambridgeMassachusettstheideawillmake_____52morefun．ManymobilephonescallalreadyVibrateinsteadofringing_____53youd0notwantpeoplet0knowyouaregettingacall．Butthese_____54aret00simpleforsubtle敏感的communication．_____55AngelaChang0fthelab’sTangibleMediaGroup．They’reeitheronoroffshesavs．ButwhenyouholdChang’smbberceHphoneyour6ngersandthumbwl’aparoundfive_____56speakers．TheyVibrate_____57yourskinaround250timespersecond．Beneaththesespeakerssitpressuresensors传感器soyoucantransmitvibrationasweuas_____58it．whenvousqueezewithafingeraVibrationsignalistransmitted_____59yourcallerscorrespondingfingeritsspeed_____60onhOWhardyousqueeze．ChaJlgsayst}latwithinafewminutes0fbeinggiventhephonesstudentswereusingtIlevibrationfea．tureto_____61emphasistowhattheyweresaying．Overtimepeopleevenbegantotransmittheirownkind0fadhoc特别的Morsecodewhichtheywouldrepeatbacktoshowtheywere_____62whatthe0therpel’sonwassaying．ChangtIlinksVibralanguage8couldfunctionforthesame_____63astextingsometimespeoplewantt0comnlunicate_____64withouteveryonenearbyknowingwhatthey’resaying．And_____65actuallybeingablet0shakesomeone’shandwhenyoucloseabusinessdealshesays．
{{*HTML*}}下面的短文后列出了7个句子请根据短文的内容对每个句子做出判断如果该句提供的是正确信息请选择A如果该句提供的是错误信息请选择B如果该句的信息文中没有提及请选择C ??????? ??????????? ?????????{{B}}Radiocarbon Dating{{/B}}??Nowadaysscientistscananswermanyquestionsabout thepastthroughatechniquecalledradiocarbon放射性碳orcarbon-14dating.One keytounderstandinghowandwhysomethinghappenedistodiscoverwhenit happened.??Radiocarbondatingwasdevelopedinthelate1940sby physicistWillardF.LibbyattheUniversityofChicago.Anatomofordinary carboncalledcarbon-12hassixprotons质子andsixneutrons中子inits nucleus原子核.Carbon-14orC-14isaradioactiveunstableformofcarbonthat hastwoextraneutrons.?Itreturnstoamorestableformofcarbonthrough aprocesscalleddecay衰减.Thisprocessinvolves?thelossoftheextra neutronsandenergyfromthenucleus.??InLibby’sradiocarbon datingtechniquetheweakradioactiveemissions放射fromthisdecayorocessare countedbyinstrumentssuchasaradiationdetectorandcounter.Thedecayrate isusedtodetermine?theproportionofC-14atomsinthesamplebeing dated.??Carbon-14isproducedintheEarth’satmospherewhen nitrogen氮-14orN-14interactswithcosmic?rays宇宙射线.Scientists believesincetheEarthwasformedtheamountofnitrogenintheatmosphere ?hasremainedconstant.ConsequentlyC-14formationisthoughttooccurat aconstantrate.NowtheratioofC-14toothercarbonatomsintheatmosphere isknown.Mostscientistsagreethatthisratioisusefulfordatingitemsback toatleast50000years.??AlllifeonEarthismadeoforganic molecules分子thatcontaincarbonatomscomingfromtheatmosphere.Soallliving thingshaveaboutthesameratioofC-14atomstoothercarbonatomsintheir tissues组织.?Onceanorganism有机体diesitstopstakingincarboninany formandtheC-14alreadypresentbeginstodecay.OvertimetheamountofC-14 inthematerialdecreasesandtheratioofC-14toothercarbonatomsgoes down.IntermsofradiocarbondatingthefewerC-14atomsinasampletheolder thatsampleis.WhenanorganismdiestheC-14initbeginstodecay.
Thechairman{{U}}proposed{{/U}}thatwestopthemeeting．
VlbraUngRubberCeHphones VibratingmbberceUphonesCOIlldbethenextbigthinginmobilecommunications．Theyallowwpeopletopressthephonel0IransmitVibrationsaJongwiththeir_____51words．Accordingt0aresearchteamattheMITMediaLabinCambridgeMassachusettstheideawillmake_____52morefun．ManymobilephonescallalreadyVibrateinsteadofringing_____53youd0notwantpeoplet0knowyouaregettingacall．Butthese_____54aret00simpleforsubtle敏感的communication．_____55AngelaChang0fthelab’sTangibleMediaGroup．They’reeitheronoroffshesavs．ButwhenyouholdChang’smbberceHphoneyour6ngersandthumbwl’aparoundfive_____56speakers．TheyVibrate_____57yourskinaround250timespersecond．Beneaththesespeakerssitpressuresensors传感器soyoucantransmitvibrationasweuas_____58it．whenvousqueezewithafingeraVibrationsignalistransmitted_____59yourcallerscorrespondingfingeritsspeed_____60onhOWhardyousqueeze．ChaJlgsayst}latwithinafewminutes0fbeinggiventhephonesstudentswereusingtIlevibrationfea．tureto_____61emphasistowhattheyweresaying．Overtimepeopleevenbegantotransmittheirownkind0fadhoc特别的Morsecodewhichtheywouldrepeatbacktoshowtheywere_____62whatthe0therpel’sonwassaying．ChangtIlinksVibralanguage8couldfunctionforthesame_____63astextingsometimespeoplewantt0comnlunicate_____64withouteveryonenearbyknowingwhatthey’resaying．And_____65actuallybeingablet0shakesomeone’shandwhenyoucloseabusinessdealshesays．
TooLatetoRegretIt WhenIwasajuniorImetasecond-yearstudentinmydepartment.Hewasn’ttallorgood-lookingbuthewasveryniceattractiveandathletic.HehadsomethingthatIadmiredverymuch.Hewasnaturalwarmandsincere. Idisregarded不顾myparents’disapproval.Wewereveryhappytogether.Hepickedmeupfrommydormeverymorningandafterclasswewouldsitalongsidethestreamthatranthroughcampusorsunbathe晒太阳onthelawn.Atnighthewouldwalkmebacktomydorm.Hecamefromapoorfamilybutinordertomakemehappyheborrowedmoneyfromhisfriendtobuypresentsandmealsforme.Ourfellowstudentslookeduptohimasarolemodelandthegirlsenvied妒忌me.Hewasn’talocalbutwantedtostayhereaftergraduation.Ithoughtwehadafuturetogether. HoweverwhenIgotapart-timejobduringthesummervacationpeoplebegangivingmealotofpressuresayingthataprettyintelligentgirllikemeshouldfindabetterguytospendtimewith.Thiswasalsowhatmyfamilythought.HespentthesummerinhishometownsoIwasallbymyself.WhenhegotbackIbeganfindingfaultwithhim.Buthisbigheartandwarmthsoondroveallunpleasantthoughtsaway.HoweverIhadnoideahowbadlyIhadhurthimandthatthingswouldgetworse. Ihadagoodpart-timejoboffcampusthatpaidprettywell.WithmygoodperformanceatschoolIalsogotadmissiontograduateschoolatoneofChina’sbestuniversities.Heontheotherhanddidnotdosowellatschooloratwork.Ihadtoworryabouthislivingexpensesjobandscores. Almostallmycolleaguesandfriendsadvisedmetobreakupwithhim.ThenwehadaquarrellastJune~Hewasingreatpainandmycoldwordsandbadmoodsstartedturninghimaway. Graduationtimewasdrawingnearandhesaidhewantedtogobacktohishometown.Hesaidthathecouldn’tputupwithmeanymore.Iwasshockedandlookedathimindespair. TruelovehappensonlyoncebutIfounditouttoolate. Whendidtheauthorfallinlovewiththeboy?
ThereisalwaysexcitementattheOlympicGameswhenanathlete{{U}}breaks{{/U}}arecord．
{{*HTML*}}下面的短文后列出了7个句子请根据短文的内容对每个句子做出判断如果该句提供的是正确信息请选择A如果该句提供的是错误信息请选择B如果该句的信息文中没有提及请选择C ??????? ??????????? ?????????{{B}}Radiocarbon Dating{{/B}}??Nowadaysscientistscananswermanyquestionsabout thepastthroughatechniquecalledradiocarbon放射性碳orcarbon-14dating.One keytounderstandinghowandwhysomethinghappenedistodiscoverwhenit happened.??Radiocarbondatingwasdevelopedinthelate1940sby physicistWillardF.LibbyattheUniversityofChicago.Anatomofordinary carboncalledcarbon-12hassixprotons质子andsixneutrons中子inits nucleus原子核.Carbon-14orC-14isaradioactiveunstableformofcarbonthat hastwoextraneutrons.?Itreturnstoamorestableformofcarbonthrough aprocesscalleddecay衰减.Thisprocessinvolves?thelossoftheextra neutronsandenergyfromthenucleus.??InLibby’sradiocarbon datingtechniquetheweakradioactiveemissions放射fromthisdecayorocessare countedbyinstrumentssuchasaradiationdetectorandcounter.Thedecayrate isusedtodetermine?theproportionofC-14atomsinthesamplebeing dated.??Carbon-14isproducedintheEarth’satmospherewhen nitrogen氮-14orN-14interactswithcosmic?rays宇宙射线.Scientists believesincetheEarthwasformedtheamountofnitrogenintheatmosphere ?hasremainedconstant.ConsequentlyC-14formationisthoughttooccurat aconstantrate.NowtheratioofC-14toothercarbonatomsintheatmosphere isknown.Mostscientistsagreethatthisratioisusefulfordatingitemsback toatleast50000years.??AlllifeonEarthismadeoforganic molecules分子thatcontaincarbonatomscomingfromtheatmosphere.Soallliving thingshaveaboutthesameratioofC-14atomstoothercarbonatomsintheir tissues组织.?Onceanorganism有机体diesitstopstakingincarboninany formandtheC-14alreadypresentbeginstodecay.OvertimetheamountofC-14 inthematerialdecreasesandtheratioofC-14toothercarbonatomsgoes down.IntermsofradiocarbondatingthefewerC-14atomsinasampletheolder thatsampleis.Theradiocarbondatingtechniqueisonlyabout40yearsold.
{{*HTML*}}请根据短文内容为每题确定1个最佳选项{{B}}第一篇{{/B}} {{B}}LightNightDark Stars{{/B}}??Thousandsofpeoplearoundtheglobestepoutsideto gazeattheirnightsky.Onaclearnightwithnocloudsmoonlightorartificial lightstoblocktheviewpeoplecanseemorethan14000starsintheskysays DennisWardanastronomer天文学家withtheUniversityCorporationfor AtmosphericResearchUCARinBoulderColo.Butwhenpeoplearesurroundedby citylightshesaysthey’reluckytosee150stars.??Ifyou’ve everdriventowardabigcityatnightandseenitsglowfromagreatdistance you’vewitessedlightpollution.Itoccurswhenlightfromstreetlightsoffice buildingssignsandothersourcesstreamsintospaceandilluminates照亮the nightsky.Thishaze朦胧oflightmakesmanystarsinvisible?topeopleon Earth.EvenatnightbigcitieslikeNewYorkglowfromlightpollutionmaking stargzalng?difficult.??Dustandparticlesofpollution factoriesandindustriesworsentheeffectsoflightpollution.Ifonecityhas alotmorelightpollutionthananotherWardsaysthatcitywillsufferthe effectsoflightpollutiononamuchgreaterscale.??Hazyskies alsomakeitfarmoredifficultforastronomerstodotheirjobs.? ?Citiesaregettinglarger.Suburbsaregrowinginoncedarkruralareas. Lightfromallthisnewdevelopmentisincreasinglyobscuring使变模糊the faint微弱的lightgiveoffbydistantstars.Andifscientistscan’tlocatethese objectstheycan’tlearnmoreaboutthem.??Lightpollution doesn’tonlyaffectstarvisibility.Itcanharmwildlifetoo.It’sclearthat artificiallightcanattractanimalsmakingthemgooffcourse.There’s increasingevidenceforexamplethatmigrating迁徙birdsusesunsetsand sunrisestohelpfindtheirwaysaysSydneyGauthreauxJr.ascientistat ClemsonUniversityinSouthCarolina.Whenlightoccursatnighthesaysit hasaverydisruptive破坏性的influence.’Sometimesbirdsflyintolighted towershigh-risesandcablesfromradioandtelevision?towers.Experts estimatethatmillionsofbirdsdiethiswayevery year.Onaclearnightpeoplecansee
MindThoseManners0ntheSubway SothereyouarejustsittingthereinthesubwayCarenjoyingthatbookyoujustbut_____46Orthepersonsittingnextt0youtakesoutanailclipper指甲刀andbeginscuttinghis0Thernails．AnnoyingMany0fushavetospendsometimeeveryday0npublictransportation_____47Sotomakethetripmorepleasant．wesuggestthefollowingLetpassengersgetoffthebus0TsubwayCarbeforeyoucanget0n_____48StandawayfromthedoorswhentheyareclosingDon’ttalkloudlyonabusoTsubway．Chattingloudlywithyourfriendscanbeannoyingt0others_____49Don’tthinkyourbagsandsuitcases手提箱deserveaseat0ftheirown．Useatissuewheneveryoucough0rsneeze打喷嚏．Anuncoveredsneezecanspreadgerms细菌especiallyincrowdedplaces．Don’tcutyournails0rpickyournoseonpublictransportation．Don’treadoverotherpeople’sshoulder_____50Itcanmakepeopleuncomfortable．Theymightthinkyou’retoostingy小气的event0buyanewspaper．0rtheymightthinkyou’rejudgingtheirbehavior．
VlbraUngRubberCeHphones VibratingmbberceUphonesCOIlldbethenextbigthinginmobilecommunications．Theyallowwpeopletopressthephonel0IransmitVibrationsaJongwiththeir_____51words．Accordingt0aresearchteamattheMITMediaLabinCambridgeMassachusettstheideawillmake_____52morefun．ManymobilephonescallalreadyVibrateinsteadofringing_____53youd0notwantpeoplet0knowyouaregettingacall．Butthese_____54aret00simpleforsubtle敏感的communication．_____55AngelaChang0fthelab’sTangibleMediaGroup．They’reeitheronoroffshesavs．ButwhenyouholdChang’smbberceHphoneyour6ngersandthumbwl’aparoundfive_____56speakers．TheyVibrate_____57yourskinaround250timespersecond．Beneaththesespeakerssitpressuresensors传感器soyoucantransmitvibrationasweuas_____58it．whenvousqueezewithafingeraVibrationsignalistransmitted_____59yourcallerscorrespondingfingeritsspeed_____60onhOWhardyousqueeze．ChaJlgsayst}latwithinafewminutes0fbeinggiventhephonesstudentswereusingtIlevibrationfea．tureto_____61emphasistowhattheyweresaying．Overtimepeopleevenbegantotransmittheirownkind0fadhoc特别的Morsecodewhichtheywouldrepeatbacktoshowtheywere_____62whatthe0therpel’sonwassaying．ChangtIlinksVibralanguage8couldfunctionforthesame_____63astextingsometimespeoplewantt0comnlunicate_____64withouteveryonenearbyknowingwhatthey’resaying．And_____65actuallybeingablet0shakesomeone’shandwhenyoucloseabusinessdealshesays．
{{*HTML*}}下面的短文后列出了7个句子请根据短文的内容对每个句子做出判断如果该句提供的是正确信息请选择A如果该句提供的是错误信息请选择B如果该句的信息文中没有提及请选择C ??????? ??????????? ?????????{{B}}Radiocarbon Dating{{/B}}??Nowadaysscientistscananswermanyquestionsabout thepastthroughatechniquecalledradiocarbon放射性碳orcarbon-14dating.One keytounderstandinghowandwhysomethinghappenedistodiscoverwhenit happened.??Radiocarbondatingwasdevelopedinthelate1940sby physicistWillardF.LibbyattheUniversityofChicago.Anatomofordinary carboncalledcarbon-12hassixprotons质子andsixneutrons中子inits nucleus原子核.Carbon-14orC-14isaradioactiveunstableformofcarbonthat hastwoextraneutrons.?Itreturnstoamorestableformofcarbonthrough aprocesscalleddecay衰减.Thisprocessinvolves?thelossoftheextra neutronsandenergyfromthenucleus.??InLibby’sradiocarbon datingtechniquetheweakradioactiveemissions放射fromthisdecayorocessare countedbyinstrumentssuchasaradiationdetectorandcounter.Thedecayrate isusedtodetermine?theproportionofC-14atomsinthesamplebeing dated.??Carbon-14isproducedintheEarth’satmospherewhen nitrogen氮-14orN-14interactswithcosmic?rays宇宙射线.Scientists believesincetheEarthwasformedtheamountofnitrogenintheatmosphere ?hasremainedconstant.ConsequentlyC-14formationisthoughttooccurat aconstantrate.NowtheratioofC-14toothercarbonatomsintheatmosphere isknown.Mostscientistsagreethatthisratioisusefulfordatingitemsback toatleast50000years.??AlllifeonEarthismadeoforganic molecules分子thatcontaincarbonatomscomingfromtheatmosphere.Soallliving thingshaveaboutthesameratioofC-14atomstoothercarbonatomsintheir tissues组织.?Onceanorganism有机体diesitstopstakingincarboninany formandtheC-14alreadypresentbeginstodecay.OvertimetheamountofC-14 inthematerialdecreasesandtheratioofC-14toothercarbonatomsgoes down.IntermsofradiocarbondatingthefewerC-14atomsinasampletheolder thatsampleis.Radarisusedtodeterminethecharacteristicsofradiocarbon.
Thegreatchangeofthecity{{U}}astonished{{/U}}allthevisitors．
Thecourageousboyhasbeenthesubjectof{{U}}massive{{/U}}mediacoverage．
RecyclingAroundtheWorld Reeyclingisone0fthebesteNVironmeutal8ucee88stories0ftllelate20theentury．ButwecoulddomoEe．Peoplemustnotseerecyclingasfashionablebutessential． TheJapaneseltreverygoodatrecyclingbecausetheyliveinacrowdedcountryTheydonothavemuchspace．Theydonotwantt0sharetheir1imitedspacewithrubbishButeVeNsoToky0areaaloneisestimatedtohavethreemilliontonsofle~overmbbishatpEesent． In1996tlleunitedStatesleeycledandcomposted制成肥料57millionton80fwaste27％ofthenation’ss801idwaste．Thisis57milliontonsofwastewhichdidnotg0intolaJldfillsandincinerators焚化炉．Indoingt11is7000mbbishcoNectionprogrammesfltndrecyclingcen~e8helpedtlleauthorities． InRockfordacityinⅡIiNOisUSitsoffieialschooseonehouseeachweekandcheckitsgarbage废物．Ifthegarbagedoesnoteontainallnewspapersoraluminium铝earlsthenlheresident0ftllehOUSegetsaprizeofatleast$1000． InJapancertaincitiesgivechildtenweekly8uPPliesoftissuepaperfilldtoiletpaperinexchfillgeforaweeklycollection0fnewspapers． InoneyefllBritainrecycles ．1outofevery3newspapeI’S． ．1out0fevery4glassbotflesandjars罐子． ．1outofevery4itoms0fc10tlling． ．1out0fevery3aluminiumdrinkcans． In1999H0ngKongtmnsported1．3miUiontons0fwastet0mailllfilldChinaforrecycling．Aroand535000tons0fwastewererecycledinHONgKongitselfovethalfthethingswethrowawayconldberecycled．ThatmeansweconldrecycIelOtimesasmuchaswed0now． HoweverrecyclingneedsalotoforganisationaJldspecialequipment．Alsothereisnotmachuseforsomerecycledmaterial． InJapanthenewspaperscollectedbychildren
{{*HTML*}}请根据短文内容为每题确定1个最佳选项{{B}}第一篇{{/B}} {{B}}LightNightDark Stars{{/B}}??Thousandsofpeoplearoundtheglobestepoutsideto gazeattheirnightsky.Onaclearnightwithnocloudsmoonlightorartificial lightstoblocktheviewpeoplecanseemorethan14000starsintheskysays DennisWardanastronomer天文学家withtheUniversityCorporationfor AtmosphericResearchUCARinBoulderColo.Butwhenpeoplearesurroundedby citylightshesaysthey’reluckytosee150stars.??Ifyou’ve everdriventowardabigcityatnightandseenitsglowfromagreatdistance you’vewitessedlightpollution.Itoccurswhenlightfromstreetlightsoffice buildingssignsandothersourcesstreamsintospaceandilluminates照亮the nightsky.Thishaze朦胧oflightmakesmanystarsinvisible?topeopleon Earth.EvenatnightbigcitieslikeNewYorkglowfromlightpollutionmaking stargzalng?difficult.??Dustandparticlesofpollution factoriesandindustriesworsentheeffectsoflightpollution.Ifonecityhas alotmorelightpollutionthananotherWardsaysthatcitywillsufferthe effectsoflightpollutiononamuchgreaterscale.??Hazyskies alsomakeitfarmoredifficultforastronomerstodotheirjobs.? ?Citiesaregettinglarger.Suburbsaregrowinginoncedarkruralareas. Lightfromallthisnewdevelopmentisincreasinglyobscuring使变模糊the faint微弱的lightgiveoffbydistantstars.Andifscientistscan’tlocatethese objectstheycan’tlearnmoreaboutthem.??Lightpollution doesn’tonlyaffectstarvisibility.Itcanharmwildlifetoo.It’sclearthat artificiallightcanattractanimalsmakingthemgooffcourse.There’s increasingevidenceforexamplethatmigrating迁徙birdsusesunsetsand sunrisestohelpfindtheirwaysaysSydneyGauthreauxJr.ascientistat ClemsonUniversityinSouthCarolina.Whenlightoccursatnighthesaysit hasaverydisruptive破坏性的influence.’Sometimesbirdsflyintolighted towershigh-risesandcablesfromradioandtelevision?towers.Experts estimatethatmillionsofbirdsdiethiswayevery year.Nowadaysevensuburbsarebecomingunsuitableforscientiststodotheirjobsbecause
MindThoseManners0ntheSubway SothereyouarejustsittingthereinthesubwayCarenjoyingthatbookyoujustbut_____46Orthepersonsittingnextt0youtakesoutanailclipper指甲刀andbeginscuttinghis0Thernails．AnnoyingMany0fushavetospendsometimeeveryday0npublictransportation_____47Sotomakethetripmorepleasant．wesuggestthefollowingLetpassengersgetoffthebus0TsubwayCarbeforeyoucanget0n_____48StandawayfromthedoorswhentheyareclosingDon’ttalkloudlyonabusoTsubway．Chattingloudlywithyourfriendscanbeannoyingt0others_____49Don’tthinkyourbagsandsuitcases手提箱deserveaseat0ftheirown．Useatissuewheneveryoucough0rsneeze打喷嚏．Anuncoveredsneezecanspreadgerms细菌especiallyincrowdedplaces．Don’tcutyournails0rpickyournoseonpublictransportation．Don’treadoverotherpeople’sshoulder_____50Itcanmakepeopleuncomfortable．Theymightthinkyou’retoostingy小气的event0buyanewspaper．0rtheymightthinkyou’rejudgingtheirbehavior．
VlbraUngRubberCeHphones VibratingmbberceUphonesCOIlldbethenextbigthinginmobilecommunications．Theyallowwpeopletopressthephonel0IransmitVibrationsaJongwiththeir_____51words．Accordingt0aresearchteamattheMITMediaLabinCambridgeMassachusettstheideawillmake_____52morefun．ManymobilephonescallalreadyVibrateinsteadofringing_____53youd0notwantpeoplet0knowyouaregettingacall．Butthese_____54aret00simpleforsubtle敏感的communication．_____55AngelaChang0fthelab’sTangibleMediaGroup．They’reeitheronoroffshesavs．ButwhenyouholdChang’smbberceHphoneyour6ngersandthumbwl’aparoundfive_____56speakers．TheyVibrate_____57yourskinaround250timespersecond．Beneaththesespeakerssitpressuresensors传感器soyoucantransmitvibrationasweuas_____58it．whenvousqueezewithafingeraVibrationsignalistransmitted_____59yourcallerscorrespondingfingeritsspeed_____60onhOWhardyousqueeze．ChaJlgsayst}latwithinafewminutes0fbeinggiventhephonesstudentswereusingtIlevibrationfea．tureto_____61emphasistowhattheyweresaying．Overtimepeopleevenbegantotransmittheirownkind0fadhoc特别的Morsecodewhichtheywouldrepeatbacktoshowtheywere_____62whatthe0therpel’sonwassaying．ChangtIlinksVibralanguage8couldfunctionforthesame_____63astextingsometimespeoplewantt0comnlunicate_____64withouteveryonenearbyknowingwhatthey’resaying．And_____65actuallybeingablet0shakesomeone’shandwhenyoucloseabusinessdealshesays．
TooLatetoRegretIt WhenIwasajuniorImetasecond-yearstudentinmydepartment.Hewasn’ttallorgood-lookingbuthewasveryniceattractiveandathletic.HehadsomethingthatIadmiredverymuch.Hewasnaturalwarmandsincere. Idisregarded不顾myparents’disapproval.Wewereveryhappytogether.Hepickedmeupfrommydormeverymorningandafterclasswewouldsitalongsidethestreamthatranthroughcampusorsunbathe晒太阳onthelawn.Atnighthewouldwalkmebacktomydorm.Hecamefromapoorfamilybutinordertomakemehappyheborrowedmoneyfromhisfriendtobuypresentsandmealsforme.Ourfellowstudentslookeduptohimasarolemodelandthegirlsenvied妒忌me.Hewasn’talocalbutwantedtostayhereaftergraduation.Ithoughtwehadafuturetogether. HoweverwhenIgotapart-timejobduringthesummervacationpeoplebegangivingmealotofpressuresayingthataprettyintelligentgirllikemeshouldfindabetterguytospendtimewith.Thiswasalsowhatmyfamilythought.HespentthesummerinhishometownsoIwasallbymyself.WhenhegotbackIbeganfindingfaultwithhim.Buthisbigheartandwarmthsoondroveallunpleasantthoughtsaway.HoweverIhadnoideahowbadlyIhadhurthimandthatthingswouldgetworse. Ihadagoodpart-timejoboffcampusthatpaidprettywell.WithmygoodperformanceatschoolIalsogotadmissiontograduateschoolatoneofChina’sbestuniversities.Heontheotherhanddidnotdosowellatschooloratwork.Ihadtoworryabouthislivingexpensesjobandscores. Almostallmycolleaguesandfriendsadvisedmetobreakupwithhim.ThenwehadaquarrellastJune~Hewasingreatpainandmycoldwordsandbadmoodsstartedturninghimaway. Graduationtimewasdrawingnearandhesaidhewantedtogobacktohishometown.Hesaidthathecouldn’tputupwithmeanymore.Iwasshockedandlookedathimindespair. TruelovehappensonlyoncebutIfounditouttoolate. Uponlearningthathewouldleavehershewas
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