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A. Formation of iceberg ? ?B. Iceberg is beautiful ? ?C. Color of iceberg ? ?D. Iceberg is dangerous...
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{{*HTML*}}RuiningtheRuins??Acidrain酸雨isnowafamiliarproblemintheindustrializedcountriesinEurope.Harmfulgasesareproducedbypowerstationsandcars.Theydissolveinrainwaterandthismakesacidrainwhichdamagestreesriversandstreams.??Acidrainisalsocapableofdissolvingsomerocks.Andbuildingsmadeofsoftrocksuchaslimestone石灰石areparticularlybadlyaffected.Theacidrainattackstherockandsocarvingsandstatuesareeroded受腐蚀morequickly.???46?AccordingtoareportintheNewScientistacidrainisbeingblamedfortherapiddecayofancientruinsinMexico.TheoldlimestonebuildingsinplaceslikeChichenItzaTulumandPalenquearewearingawayveryquicklyindeed.ThesesitesaretheremainsofthebuildingsbuiltbytheMayasbetween250BCandAD900andthespectacularruinsofMayancivilizationarevisitedbythousandsoftouristseveryyear.??Butthoseruinsareindangerofbeingseriouslydamagedbypollution.Atmanysitesthestonehasbeencoveredwithalayerofblacksubstance.?47?.??Scientistsestimatethataboutonemillimeterofstoneiswornawayeverytwelveyears.?48?TheacidrainissaidtobecausedbypollutionfromoilwellsintheGulfofMexico.Carexhaustgasesarealsoaproblem.Localvolcaniceruptionsmaketheproblemevenworse.Neverthelesswithenoughmoneyandeffortresearcherssaythatmanyoftheproblemscouldbesolvedandtherateoferosionreduced.?49?.??Mexico’scurrentlackoffundsisalsopartlyduetooil.ThecountryhasrichoilfieldsandafewyearsagowhenoilwasexpensiveMexicowassellinglargequantitiesofoiltotheUSAandearningalotofmoney.?50?HoweverthepriceofoilthendroppedandMexicohasbeenleftowingenormoussumsofmoneyandwithnotenoughincomefromoilsalestopaybacktheloans.SounlessthepriceofoilrisesitisunlikelythatMexicowillbeabletoaffordtocleanupthepollutionandsaveitsMayanruinsfromdestruction.??A.Atothersthepaintedsurfacesinsidetemplesareliftingandflakingoffandthestoneisbeingeatenaway.??B.Thatisenoughtohavecausedsomeoftheancientcarvingstobecomeseriouslydamagedalready.??C.Thesemeasureswouldreducethepollutionbutwouldnotstopitcompletely.??D.Thegovernmentwasthereforeabletoborrowhugesumsofmoneyfrombanksaroundtheworldthinkingtheywouldhavenoproblemrepayingtheirdebts.??E.TheproblemhoweverisnotjustaEuropeanone.??F.HowevertheMexicangovernmentdoesnothaveenoughmoneytodotheworkandneedstospendwhatmoneyithasontheMexicanpeople.
NewFoodsandtheNewWorldInthelast500yearsnothingaboutpeople—nottheirclothesideasorlanguages—haschangedasmuchaswhattheyeat.Theoriginalchocolatedrinkwasmadefromtheseedsofthecocoatree可可树bySouthAmericanIndians.TheSpanishintroducedittotherestoftheworldduringthe1500’s.Andalthoughitwasveryexpensiveitquicklybecamefashionable.InLondonshopswherechocolatedrinkswereservedbecameimportantmeetingplaces.Somestillexisttoday.ThepotatoisalsofromtheNewWorld.Around1600theSpanishbroughtitfromPerutoEuropewhereitsoonwaswidelygrown.IrelandbecamesodependentonitthatthousandsofIrishpeoplestarvedwhenthecropfailedduringthePotatoFamine饥荒of1845—1846andthousandsmorewereforcedtoleavetheirhomelandandmovetoAmerica.TherearemanyotherfoodsthathavetraveledfromSouthAmericatotheOldWorld.Butsomeotherswentintheoppositedirection.Brazilisnowtheworld’slargestgrowerofcoffeeandcoffeeisanimportantcropinColombiaandotherSouthAmericancountries.ButitisnativetoEthiopiaacountryinAfrica.ItwasfirstmadeintoadrinkbyArabsduringthe1400’s.AccordingtoanArabiclegendcoffeewasdiscoveredwhenapersonnamedKaldinoticedthathisgoatswereattractedtotheredberriesonacoffeebush.Hetriedoneandexperiencedthewide-awakefeelingthatone-thirdoftheworld’spopulationnowstartsthedaywith.Accordingtothepassagewhichofthefollowinghaschangedthemostinthelast500years
Continuousshortbuzzesonthetelephoneindicatethatthelineisbusyafteryoudialthetelephonenumber.
NoJetlag时差反应Anymore Mostpeoplewhotravellongdistancescomplainofjetlag时差反应.Jetlagmakesbusinesstravelerslessproductive对产的有成效的andmoreprone51makingmistakes.Itisactuallycausedby52ofyour"bodyclock"-asmallcluster串组群ofbraincellsthatcontrolsthetimingofbiological53.Thebodyclockisdesignedforaregularrhythm节奏ofdaylightanddarknesssothatitisthrownoutofbalancewhenitexperiencesdaylightanddarknessatthe"wrong"timesinanewtimezone.The54ofjetlagoftenpersist持续fordays55theinternalbodyclockslowlyadjuststothenewtimezone. Nowanewanti-jetlagsystemisavailablethatisbasedonproven56andpioneeringscientificresearch.Dr.MartinMoorehasdevisedapracticalstrategytoadjustthebodyclockmuchsoonertothenewtimezone57controlledexposuretobrightlight.Thetimezoneshift转换iseasytoaccomplishandeliminates消除58ofthediscomfortofjetlag Asuccessfultimezoneshiftdependsonknowingtheexacttimestoeither59oravoidbrightlight.Exposuretolightatthewrongtimecanactuallymakejetlagworse.Theproperschedule60lightexposuredependsagreatdealon61travelplans. Dataonaspecificflightitinerary旅行路线andtheindividual’ssleep62areusedtoproduceatripguidewith63onexactlywhentobeexposedtobrightlight. Whenthetripguidecalls64brightlightyoushouldspendtimeoutdoorsifpossible.Ifitisdarkoutsideortheweatherisbad65youareonanairplaneyoucanuseaspeciallightdevicetoprovidethenecessarylightstimulus刺激forarangeofactivitiessuchasreadingwatchingTVorworking. 56
ChinatoHelpEuropeDevelopGPS全球定位系统RivalChinaistocontributetoanewglobalsatellitenavigationsystembeingdevelopedbyEuropeannations.TheGalileosatellitesystem51amoreaccuratecivilianalternativetotheGlobalPositioningSystemGPSoperatedbytheUSmilitary.Chinawillprovide230mEurosUSD259min52andwillcooperatewithtechnicalmanufacturingandmarketdevelopment.ChinawillhelpGalileoto53themajorworldinfrastructure基础设施forthegrowingmarketforlocationservicessaidLoyoladePalacioEUtransportcommissioner.A.speedB.directionC.distanceD.location
ChinatoHelpEuropeDevelopGPS全球定位系统RivalChinaistocontributetoanewglobalsatellitenavigationsystembeingdevelopedbyEuropeannations.TheGalileosatellitesystem51amoreaccuratecivilianalternativetotheGlobalPositioningSystemGPSoperatedbytheUSmilitary.Chinawillprovide230mEurosUSD259min52andwillcooperatewithtechnicalmanufacturingandmarketdevelopment.ChinawillhelpGalileoto53themajorworldinfrastructure基础设施forthegrowingmarketforlocationservicessaidLoyoladePalacioEUtransportcommissioner.A.spendB.gainC.giveD.cost
ChinatoHelpEuropeDevelopGPS全球定位系统RivalChinaistocontributetoanewglobalsatellitenavigationsystembeingdevelopedbyEuropeannations.TheGalileosatellitesystem51amoreaccuratecivilianalternativetotheGlobalPositioningSystemGPSoperatedbytheUSmilitary.Chinawillprovide230mEurosUSD259min52andwillcooperatewithtechnicalmanufacturingandmarketdevelopment.ChinawillhelpGalileoto53themajorworldinfrastructure基础设施forthegrowingmarketforlocationservicessaidLoyoladePalacioEUtransportcommissioner.A.officialsB.countriesC.organizationD.agreement
Thebooktooktenyearsofthoroughresearch.
NewFoodsandtheNewWorld Inthelast500yearsnothingaboutpeople—nottheirclothesideasorlanguages—haschangedasmuchaswhattheyeat.Theoriginalchocolatedrinkwasmadefromtheseedsofthecocoatree可可树bySouthAmericanIndians.TheSpanishintroducedittotherestoftheworldduringthe1500’s.Andalthoughitwasveryexpensiveitquicklybecamefashionable.InLondonshopswherechocolatedrinkswereservedbecameimportantmeetingplaces.Somestillexisttoday. ThepotatoisalsofromtheNewWorld.Around1600theSpanishbroughtitfromPerutoEuropewhereitsoonwaswidelygrown.IrelandbecamesodependentonitthatthousandsofIrishpeoplestarvedwhenthecropfailedduringthe"PotatoFamine饥荒"of1845—1846andthousandsmorewereforcedtoleavetheirhomelandandmovetoAmerica. TherearemanyotherfoodsthathavetraveledfromSouthAmericatotheOldWorld.Butsomeotherswentintheoppositedirection.Brazilisnowtheworld’slargestgrowerofcoffeeandcoffeeisanimportantcropinColombiaandotherSouthAmericancountries.ButitisnativetoEthiopiaacountryinAfrica.ItwasfirstmadeintoadrinkbyArabsduringthe1400’s. AccordingtoanArabiclegendcoffeewasdiscoveredwhenapersonnamedKaldinoticedthathisgoatswereattractedtotheredberriesonacoffeebush.Hetriedoneandexperiencedthe"wide-awake"feelingthatone-thirdoftheworld’spopulationnowstartsthedaywith. WhichofthefollowingstatementsisNOTtrueaccordingtothepassage
NewFoodsandtheNewWorld Inthelast500yearsnothingaboutpeople—nottheirclothesideasorlanguages—haschangedasmuchaswhattheyeat.Theoriginalchocolatedrinkwasmadefromtheseedsofthecocoatree可可树bySouthAmericanIndians.TheSpanishintroducedittotherestoftheworldduringthe1500’s.Andalthoughitwasveryexpensiveitquicklybecamefashionable.InLondonshopswherechocolatedrinkswereservedbecameimportantmeetingplaces.Somestillexisttoday. ThepotatoisalsofromtheNewWorld.Around1600theSpanishbroughtitfromPerutoEuropewhereitsoonwaswidelygrown.IrelandbecamesodependentonitthatthousandsofIrishpeoplestarvedwhenthecropfailedduringthe"PotatoFamine饥荒"of1845—1846andthousandsmorewereforcedtoleavetheirhomelandandmovetoAmerica. TherearemanyotherfoodsthathavetraveledfromSouthAmericatotheOldWorld.Butsomeotherswentintheoppositedirection.Brazilisnowtheworld’slargestgrowerofcoffeeandcoffeeisanimportantcropinColombiaandotherSouthAmericancountries.ButitisnativetoEthiopiaacountryinAfrica.ItwasfirstmadeintoadrinkbyArabsduringthe1400’s. AccordingtoanArabiclegendcoffeewasdiscoveredwhenapersonnamedKaldinoticedthathisgoatswereattractedtotheredberriesonacoffeebush.Hetriedoneandexperiencedthe"wide-awake"feelingthatone-thirdoftheworld’spopulationnowstartsthedaywith. ThousandsofIrishpeoplestarvedduringthePotatoFaminebecause
BlackHoles WhatisablackholeWellit’sdifficulttoanswerthisquestionsincethetermswenormallyusetodescribeascientificphenomenonareinadequatehereAstronomersandscientiststhinkthatablackholeisaregionofspacenotathingintowhichmatterhasfallenandfromwhichnothingcanescape—notevenlight.Sowecan’tseeablackhole.Ablackholeexerts施加astronggravitational重力的pullandyetithasnomatter.Itisonlyspace—orsowethink.Howcanthishappen Thetheoryisthatsomestarsexplodewhentheirdensityincreasestoaparticularpoint;they"collapse"andsometimesasupernova超新星occurs.Thecollapseofastarmayproducea"WhiteDwarf白矮星"ora"neutronstar"—astarwhosematterissodensethatitcontinuallyshrinksbytheforceofitsowngravity.Butifthestarisverylargethisprocessofshrinkingmaybesointensethatablackholeresults.Imaginetheearthreducedtothesizeofamarblebutstillhavingthesamemassandastrongergravitationalpullandyouhavesomeideaoftheforceofablackhole.AnymatterneartheblackholeIssuckedin.ItisimpossibletosaywhathappensInsideablackhole. Ourspaceandtimelawsdon’tseemtoapplytoobjectsintheareaofablackhole.Einstein’srelativitytheoryistheonlyonethatcanexplainsuchphenomena.Einsteinclaimedthatmatterandenergyareinterchangeablesothatthereisno"absolute"timeandspaceTherearenoconstantsatallandmeasurementsoftimeandspacedependonthepositionoftheobserver—theyarerelative.Einstein’stheoryprovidedabasisfortheideaofblackholesbeforeastronomersstartedtofindsomeevidencefortheirexistence.Itisonlyrecentlythatastronomershavebegunspecificresearchintoblackholes. Themostconvincingevidenceofblackholescomesfromresearchintobinary由两部分组成的starsystems.Insomebinarystarsystemsastronomershaveshownthatthereisaninvisiblecompanionstara"partner"totheonewhichwecanseeinthesky.ThereisonestarcalledbyitscataloguenumberHDE226868whichmusthaveaPartner.Thispartnerstaritseemshasamasstenortwentytimesgreaterthanthesun—yetwecan’tseeit.MatterfromHDE226868isbeingdraggedtowardsthiscompanionstar.CouldthisinvisiblestarwhichexertssuchagreatforcebeablackholeAstronomershaveevidenceofafewotherstarstoowhichmighthaveblackholesascompanions. AccordingtoEinstein’stheoryobjectsintheareaofablackhole
{{*HTML*}}A.borntobemoreintelligentorlessintelligent??B.haveabetterchancetodevelophisintelligence??C.taughttobemoreintelligent??D.thatintelligencewassomethingababywasbornwith??E.andbecauseofthelackofcommunicationwithhisclassmates??F.andpartlystimulatedItwasoncebelieved______andthuswecantellhowsuccessfulshe/hewillbeinthefutureaccordingtohis/herintelligence.
NoJetlag时差反应Anymore Mostpeoplewhotravellongdistancescomplainofjetlag时差反应.Jetlagmakesbusinesstravelerslessproductive对产的有成效的andmoreprone51makingmistakes.Itisactuallycausedby52ofyour"bodyclock"-asmallcluster串组群ofbraincellsthatcontrolsthetimingofbiological53.Thebodyclockisdesignedforaregularrhythm节奏ofdaylightanddarknesssothatitisthrownoutofbalancewhenitexperiencesdaylightanddarknessatthe"wrong"timesinanewtimezone.The54ofjetlagoftenpersist持续fordays55theinternalbodyclockslowlyadjuststothenewtimezone. Nowanewanti-jetlagsystemisavailablethatisbasedonproven56andpioneeringscientificresearch.Dr.MartinMoorehasdevisedapracticalstrategytoadjustthebodyclockmuchsoonertothenewtimezone57controlledexposuretobrightlight.Thetimezoneshift转换iseasytoaccomplishandeliminates消除58ofthediscomfortofjetlag Asuccessfultimezoneshiftdependsonknowingtheexacttimestoeither59oravoidbrightlight.Exposuretolightatthewrongtimecanactuallymakejetlagworse.Theproperschedule60lightexposuredependsagreatdealon61travelplans. Dataonaspecificflightitinerary旅行路线andtheindividual’ssleep62areusedtoproduceatripguidewith63onexactlywhentobeexposedtobrightlight. Whenthetripguidecalls64brightlightyoushouldspendtimeoutdoorsifpossible.Ifitisdarkoutsideortheweatherisbad65youareonanairplaneyoucanuseaspeciallightdevicetoprovidethenecessarylightstimulus刺激forarangeofactivitiessuchasreadingwatchingTVorworking. 58
{{*HTML*}}RuiningtheRuins??Acidrain酸雨isnowafamiliarproblemintheindustrializedcountriesinEurope.Harmfulgasesareproducedbypowerstationsandcars.Theydissolveinrainwaterandthismakesacidrainwhichdamagestreesriversandstreams.??Acidrainisalsocapableofdissolvingsomerocks.Andbuildingsmadeofsoftrocksuchaslimestone石灰石areparticularlybadlyaffected.Theacidrainattackstherockandsocarvingsandstatuesareeroded受腐蚀morequickly.???46?AccordingtoareportintheNewScientistacidrainisbeingblamedfortherapiddecayofancientruinsinMexico.TheoldlimestonebuildingsinplaceslikeChichenItzaTulumandPalenquearewearingawayveryquicklyindeed.ThesesitesaretheremainsofthebuildingsbuiltbytheMayasbetween250BCandAD900andthespectacularruinsofMayancivilizationarevisitedbythousandsoftouristseveryyear.??Butthoseruinsareindangerofbeingseriouslydamagedbypollution.Atmanysitesthestonehasbeencoveredwithalayerofblacksubstance.?47?.??Scientistsestimatethataboutonemillimeterofstoneiswornawayeverytwelveyears.?48?TheacidrainissaidtobecausedbypollutionfromoilwellsintheGulfofMexico.Carexhaustgasesarealsoaproblem.Localvolcaniceruptionsmaketheproblemevenworse.Neverthelesswithenoughmoneyandeffortresearcherssaythatmanyoftheproblemscouldbesolvedandtherateoferosionreduced.?49?.??Mexico’scurrentlackoffundsisalsopartlyduetooil.ThecountryhasrichoilfieldsandafewyearsagowhenoilwasexpensiveMexicowassellinglargequantitiesofoiltotheUSAandearningalotofmoney.?50?HoweverthepriceofoilthendroppedandMexicohasbeenleftowingenormoussumsofmoneyandwithnotenoughincomefromoilsalestopaybacktheloans.SounlessthepriceofoilrisesitisunlikelythatMexicowillbeabletoaffordtocleanupthepollutionandsaveitsMayanruinsfromdestruction.??A.Atothersthepaintedsurfacesinsidetemplesareliftingandflakingoffandthestoneisbeingeatenaway.??B.Thatisenoughtohavecausedsomeoftheancientcarvingstobecomeseriouslydamagedalready.??C.Thesemeasureswouldreducethepollutionbutwouldnotstopitcompletely.??D.Thegovernmentwasthereforeabletoborrowhugesumsofmoneyfrombanksaroundtheworldthinkingtheywouldhavenoproblemrepayingtheirdebts.??E.TheproblemhoweverisnotjustaEuropeanone.??F.HowevertheMexicangovernmentdoesnothaveenoughmoneytodotheworkandneedstospendwhatmoneyithasontheMexicanpeople.
Aresearchcenterhasbeensetupinthiscountry.
NoJetlag时差反应Anymore Mostpeoplewhotravellongdistancescomplainofjetlag时差反应.Jetlagmakesbusinesstravelerslessproductive对产的有成效的andmoreprone51makingmistakes.Itisactuallycausedby52ofyour"bodyclock"-asmallcluster串组群ofbraincellsthatcontrolsthetimingofbiological53.Thebodyclockisdesignedforaregularrhythm节奏ofdaylightanddarknesssothatitisthrownoutofbalancewhenitexperiencesdaylightanddarknessatthe"wrong"timesinanewtimezone.The54ofjetlagoftenpersist持续fordays55theinternalbodyclockslowlyadjuststothenewtimezone. Nowanewanti-jetlagsystemisavailablethatisbasedonproven56andpioneeringscientificresearch.Dr.MartinMoorehasdevisedapracticalstrategytoadjustthebodyclockmuchsoonertothenewtimezone57controlledexposuretobrightlight.Thetimezoneshift转换iseasytoaccomplishandeliminates消除58ofthediscomfortofjetlag Asuccessfultimezoneshiftdependsonknowingtheexacttimestoeither59oravoidbrightlight.Exposuretolightatthewrongtimecanactuallymakejetlagworse.Theproperschedule60lightexposuredependsagreatdealon61travelplans. Dataonaspecificflightitinerary旅行路线andtheindividual’ssleep62areusedtoproduceatripguidewith63onexactlywhentobeexposedtobrightlight. Whenthetripguidecalls64brightlightyoushouldspendtimeoutdoorsifpossible.Ifitisdarkoutsideortheweatherisbad65youareonanairplaneyoucanuseaspeciallightdevicetoprovidethenecessarylightstimulus刺激forarangeofactivitiessuchasreadingwatchingTVorworking. 54
14Inthelattercasetheoutcomecanbeseriousindeed.
{{*HTML*}}RuiningtheRuins??Acidrain酸雨isnowafamiliarproblemintheindustrializedcountriesinEurope.Harmfulgasesareproducedbypowerstationsandcars.Theydissolveinrainwaterandthismakesacidrainwhichdamagestreesriversandstreams.??Acidrainisalsocapableofdissolvingsomerocks.Andbuildingsmadeofsoftrocksuchaslimestone石灰石areparticularlybadlyaffected.Theacidrainattackstherockandsocarvingsandstatuesareeroded受腐蚀morequickly.???46?AccordingtoareportintheNewScientistacidrainisbeingblamedfortherapiddecayofancientruinsinMexico.TheoldlimestonebuildingsinplaceslikeChichenItzaTulumandPalenquearewearingawayveryquicklyindeed.ThesesitesaretheremainsofthebuildingsbuiltbytheMayasbetween250BCandAD900andthespectacularruinsofMayancivilizationarevisitedbythousandsoftouristseveryyear.??Butthoseruinsareindangerofbeingseriouslydamagedbypollution.Atmanysitesthestonehasbeencoveredwithalayerofblacksubstance.?47?.??Scientistsestimatethataboutonemillimeterofstoneiswornawayeverytwelveyears.?48?TheacidrainissaidtobecausedbypollutionfromoilwellsintheGulfofMexico.Carexhaustgasesarealsoaproblem.Localvolcaniceruptionsmaketheproblemevenworse.Neverthelesswithenoughmoneyandeffortresearcherssaythatmanyoftheproblemscouldbesolvedandtherateoferosionreduced.?49?.??Mexico’scurrentlackoffundsisalsopartlyduetooil.ThecountryhasrichoilfieldsandafewyearsagowhenoilwasexpensiveMexicowassellinglargequantitiesofoiltotheUSAandearningalotofmoney.?50?HoweverthepriceofoilthendroppedandMexicohasbeenleftowingenormoussumsofmoneyandwithnotenoughincomefromoilsalestopaybacktheloans.SounlessthepriceofoilrisesitisunlikelythatMexicowillbeabletoaffordtocleanupthepollutionandsaveitsMayanruinsfromdestruction.??A.Atothersthepaintedsurfacesinsidetemplesareliftingandflakingoffandthestoneisbeingeatenaway.??B.Thatisenoughtohavecausedsomeoftheancientcarvingstobecomeseriouslydamagedalready.??C.Thesemeasureswouldreducethepollutionbutwouldnotstopitcompletely.??D.Thegovernmentwasthereforeabletoborrowhugesumsofmoneyfrombanksaroundtheworldthinkingtheywouldhavenoproblemrepayingtheirdebts.??E.TheproblemhoweverisnotjustaEuropeanone.??F.HowevertheMexicangovernmentdoesnothaveenoughmoneytodotheworkandneedstospendwhatmoneyithasontheMexicanpeople.
BlackHoles WhatisablackholeWellit’sdifficulttoanswerthisquestionsincethetermswenormallyusetodescribeascientificphenomenonareinadequatehereAstronomersandscientiststhinkthatablackholeisaregionofspacenotathingintowhichmatterhasfallenandfromwhichnothingcanescape—notevenlight.Sowecan’tseeablackhole.Ablackholeexerts施加astronggravitational重力的pullandyetithasnomatter.Itisonlyspace—orsowethink.Howcanthishappen Thetheoryisthatsomestarsexplodewhentheirdensityincreasestoaparticularpoint;they"collapse"andsometimesasupernova超新星occurs.Thecollapseofastarmayproducea"WhiteDwarf白矮星"ora"neutronstar"—astarwhosematterissodensethatitcontinuallyshrinksbytheforceofitsowngravity.Butifthestarisverylargethisprocessofshrinkingmaybesointensethatablackholeresults.Imaginetheearthreducedtothesizeofamarblebutstillhavingthesamemassandastrongergravitationalpullandyouhavesomeideaoftheforceofablackhole.AnymatterneartheblackholeIssuckedin.ItisimpossibletosaywhathappensInsideablackhole. Ourspaceandtimelawsdon’tseemtoapplytoobjectsintheareaofablackhole.Einstein’srelativitytheoryistheonlyonethatcanexplainsuchphenomena.Einsteinclaimedthatmatterandenergyareinterchangeablesothatthereisno"absolute"timeandspaceTherearenoconstantsatallandmeasurementsoftimeandspacedependonthepositionoftheobserver—theyarerelative.Einstein’stheoryprovidedabasisfortheideaofblackholesbeforeastronomersstartedtofindsomeevidencefortheirexistence.Itisonlyrecentlythatastronomershavebegunspecificresearchintoblackholes. Themostconvincingevidenceofblackholescomesfromresearchintobinary由两部分组成的starsystems.Insomebinarystarsystemsastronomershaveshownthatthereisaninvisiblecompanionstara"partner"totheonewhichwecanseeinthesky.ThereisonestarcalledbyitscataloguenumberHDE226868whichmusthaveaPartner.Thispartnerstaritseemshasamasstenortwentytimesgreaterthanthesun—yetwecan’tseeit.MatterfromHDE226868isbeingdraggedtowardsthiscompanionstar.CouldthisinvisiblestarwhichexertssuchagreatforcebeablackholeAstronomershaveevidenceofafewotherstarstoowhichmighthaveblackholesascompanions. Whydoestheauthorputneutronstarinquotationmarks
{{*HTML*}}A.toomuchenergyB.basedonAmericandesignsC.theyaretoocostlyD.theyarenotreliableE.qualitycontrolF.freeofchargeEventhemostsophisticatedJapaneserobotsare______.
Hehasestablishedhimselftobeacompetentmanagerbyhissuccessfullyhandlingseveraldifficulttasks.
TheNeedtoRemember Somepeoplesaytheyhavenomemoryatall:"Ijustcan’trememberathing!"Butofcourseweallhaveamemory.Ourmemorytellsuswhoweare.Ourmemoryhelpsustomakeuseinthepresentofwhatwehavelearntinthepast. InfactwehavedifferenttypesofmemoryForexampleourvisualmemoryhelpsusrecallfactsandplaces.Somepeoplehavesuchastrongvisualmemorytheycanrememberexactlywhattheyhaveseenforexamplepagesofabookasacompletepicture. Ourverbal言语的memoryhelpsusrememberwordsandfigureswemayhaveheardbutnotseenorwritten:itemsofashoppinglistachemicalformuladatesorarecipe. Withouremotional情感的memorywerecallsituationsorplaceswherewehadstrongfeelingsperhapsofhappinessorunhappiness.Wealsohavespecialmemoriesforsmelltastetouchandsoundandforperformingphysicalmovements. Wehavetwowaysofstoringanyofthesememories.Ourshort-termmemorystoresitemsforuptothirtyseconds-enoughtorememberatelephonenumberwhilewedial.Ourlong-termmemoryontheotherhandmaystoreitemsforalifetime.Olderpeopleinfacthaveamuchbetterlong-termmemorythanshort-term.Theymayforgetwhattheyhavedoneonlyafewhoursagobuthavetheclearestremembrance记忆ofwhentheywereveryyoung. Psychologiststellusthatweonlyrememberafewfactsaboutourpastandthatweinventtherest.Itisasthoughwerememberonlytheoutlineofastory.Wethenmakeupthedetails.Weoftendothisinthewaywewanttorememberthemusuallysothatweappearastheheroesofourownpast-ormaybevictimsneedingsympathy同情. Emotionalmemoryisusedwhenweperformphysicalmovements.
TheNeedtoRemember Somepeoplesaytheyhavenomemoryatall:"Ijustcan’trememberathing!"Butofcourseweallhaveamemory.Ourmemorytellsuswhoweare.Ourmemoryhelpsustomakeuseinthepresentofwhatwehavelearntinthepast. InfactwehavedifferenttypesofmemoryForexampleourvisualmemoryhelpsusrecallfactsandplaces.Somepeoplehavesuchastrongvisualmemorytheycanrememberexactlywhattheyhaveseenforexamplepagesofabookasacompletepicture. Ourverbal言语的memoryhelpsusrememberwordsandfigureswemayhaveheardbutnotseenorwritten:itemsofashoppinglistachemicalformuladatesorarecipe. Withouremotional情感的memorywerecallsituationsorplaceswherewehadstrongfeelingsperhapsofhappinessorunhappiness.Wealsohavespecialmemoriesforsmelltastetouchandsoundandforperformingphysicalmovements. Wehavetwowaysofstoringanyofthesememories.Ourshort-termmemorystoresitemsforuptothirtyseconds-enoughtorememberatelephonenumberwhilewedial.Ourlong-termmemoryontheotherhandmaystoreitemsforalifetime.Olderpeopleinfacthaveamuchbetterlong-termmemorythanshort-term.Theymayforgetwhattheyhavedoneonlyafewhoursagobuthavetheclearestremembrance记忆ofwhentheywereveryyoung. Psychologiststellusthatweonlyrememberafewfactsaboutourpastandthatweinventtherest.Itisasthoughwerememberonlytheoutlineofastory.Wethenmakeupthedetails.Weoftendothisinthewaywewanttorememberthemusuallysothatweappearastheheroesofourownpast-ormaybevictimsneedingsympathy同情. Visualmemorymaybeusedwhenwereadastory.
{{*HTML*}}A.toomuchenergyB.basedonAmericandesignsC.theyaretoocostlyD.theyarenotreliableE.qualitycontrolF.freeofchargeOnedisadvantageofusingrobotsisthattheyconsume______.
NoJetlag时差反应Anymore Mostpeoplewhotravellongdistancescomplainofjetlag时差反应.Jetlagmakesbusinesstravelerslessproductive对产的有成效的andmoreprone51makingmistakes.Itisactuallycausedby52ofyour"bodyclock"-asmallcluster串组群ofbraincellsthatcontrolsthetimingofbiological53.Thebodyclockisdesignedforaregularrhythm节奏ofdaylightanddarknesssothatitisthrownoutofbalancewhenitexperiencesdaylightanddarknessatthe"wrong"timesinanewtimezone.The54ofjetlagoftenpersist持续fordays55theinternalbodyclockslowlyadjuststothenewtimezone. Nowanewanti-jetlagsystemisavailablethatisbasedonproven56andpioneeringscientificresearch.Dr.MartinMoorehasdevisedapracticalstrategytoadjustthebodyclockmuchsoonertothenewtimezone57controlledexposuretobrightlight.Thetimezoneshift转换iseasytoaccomplishandeliminates消除58ofthediscomfortofjetlag Asuccessfultimezoneshiftdependsonknowingtheexacttimestoeither59oravoidbrightlight.Exposuretolightatthewrongtimecanactuallymakejetlagworse.Theproperschedule60lightexposuredependsagreatdealon61travelplans. Dataonaspecificflightitinerary旅行路线andtheindividual’ssleep62areusedtoproduceatripguidewith63onexactlywhentobeexposedtobrightlight. Whenthetripguidecalls64brightlightyoushouldspendtimeoutdoorsifpossible.Ifitisdarkoutsideortheweatherisbad65youareonanairplaneyoucanuseaspeciallightdevicetoprovidethenecessarylightstimulus刺激forarangeofactivitiessuchasreadingwatchingTVorworking. 52
{{*HTML*}}A.borntobemoreintelligentorlessintelligent??B.haveabetterchancetodevelophisintelligence??C.taughttobemoreintelligent??D.thatintelligencewassomethingababywasbornwith??E.andbecauseofthelackofcommunicationwithhisclassmates??F.andpartlystimulatedItcanbeinferredfromthepassagethatachildwill______ifhehasmoreopportunitiestocommunicatewithothersbymeansoflanguage.
Jeanhasmadeuphermindnottogotothemeeting.
Argumentamongthespeakersattheconferenceisborderingonviolence.
TheNeedtoRemember Somepeoplesaytheyhavenomemoryatall:"Ijustcan’trememberathing!"Butofcourseweallhaveamemory.Ourmemorytellsuswhoweare.Ourmemoryhelpsustomakeuseinthepresentofwhatwehavelearntinthepast. InfactwehavedifferenttypesofmemoryForexampleourvisualmemoryhelpsusrecallfactsandplaces.Somepeoplehavesuchastrongvisualmemorytheycanrememberexactlywhattheyhaveseenforexamplepagesofabookasacompletepicture. Ourverbal言语的memoryhelpsusrememberwordsandfigureswemayhaveheardbutnotseenorwritten:itemsofashoppinglistachemicalformuladatesorarecipe. Withouremotional情感的memorywerecallsituationsorplaceswherewehadstrongfeelingsperhapsofhappinessorunhappiness.Wealsohavespecialmemoriesforsmelltastetouchandsoundandforperformingphysicalmovements. Wehavetwowaysofstoringanyofthesememories.Ourshort-termmemorystoresitemsforuptothirtyseconds-enoughtorememberatelephonenumberwhilewedial.Ourlong-termmemoryontheotherhandmaystoreitemsforalifetime.Olderpeopleinfacthaveamuchbetterlong-termmemorythanshort-term.Theymayforgetwhattheyhavedoneonlyafewhoursagobuthavetheclearestremembrance记忆ofwhentheywereveryyoung. Psychologiststellusthatweonlyrememberafewfactsaboutourpastandthatweinventtherest.Itisasthoughwerememberonlytheoutlineofastory.Wethenmakeupthedetails.Weoftendothisinthewaywewanttorememberthemusuallysothatweappearastheheroesofourownpast-ormaybevictimsneedingsympathy同情. Long-termmemoryismoreimportantthanshort-termmemory.
FrancehaskeptintimatelinkswithitsformerAfricanterritories.
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