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Mother Nature Shows Her Strength Tornadoes(龙卷风)and heavy thunderstorms moved across the Great L...
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理工类《单选集》真题及答案
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短文改错MyMother—AWomanIAdmireMostThewomanwhomIadmirem
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{{*HTML*}}{{B}}第三篇{{/B}} WalkingtoExercisetheBrain? ?Doyouthinksittingandstudyingallthetimewillimprove students’grades?Thinkagain．Gettingsomeexercisemayhelptoo．? ?Newresearchwitholderpeoplesuggeststhattakingregularwalkshelps thempayattentionbetterthaniftheydidn’texercise．? ?Previousresearchhadshownthatmicelearnrememberandpayattention betterafterafewweeksofworkingoutonarunningwheel．Micethatexercise havegreaterbloodflowtothebrainthanthosewhodon’t．Theirbraincellsalso makemoreconnections．??Neuroscientists神经科学家fromthe UniversityofIllinoisatUrbana-Champaignwantedtofindoutifthesamething istrueforpeople．Firsttheymeasuredthephysicalfitnessof41adultsages58 to77aftereachpersonwalked1mile．Thenparticipantslookedatarrowsona computerscreenandhadtousecomputerkeystoshowwhichwayoneparticular arrowwaspointing．??Adultswhowerephysicallyfitwerefaster atthearrowtaskandtheiranswerswerejustasaccurateastheirless-fit peerstheresearchersfound．Thefitterparticipantsalsohadmorebloodflowto apartoftheirbrainresponsibleforpayingattentionandmakingdecisions． ??Inasecondstudy15elderlypeoplewhocompleteda6-month aerobic-training有氧运动coursewerefasteratattentiontaskscomparedwith14 seniorswhojustdidstretchingandtoning韵律操exercisesforthesameamountof time.??Soevengoingforawalkevery2or3daysforjust10to 45minutescanhelp．Thatshouldbegoodnewsfortheelderly．? ?Theeffectsofexercisingonthebrainsofyoungerpeoplehaven’tbeen studiedyet．Stillitcan’thurttotakeoccasionalbreaksandgoforawalkor runaroundwithfriends．Whateveryoudothoughdon’ttrytoreadandwalkatthe sametime．Youcouldenduphurtingyourself!Itissuggestedinthelastparagraphthatpeopleshould
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 SeeingRedMeansDangerAhead? ?Thecolorredoftenmeansdanger-andbypayingattentionaccidentscanbe prevented．Inthefuturethecolorredalsomayhelp{{U}}?51 ?{{/U}}dangeratconstructionsites．Thankstonewworkbyengineersbridge supports-or{{U}}?52?{{/U}}kindsofmaterials-couldonedaycontaina color-changingmaterial．Itwillturnred{{U}}?53?{{/U}}astructure collapsesorfallsapart．??Thesecret{{U}}?54 ?{{/U}}thecolor-changingmaterialisaparticulartypeofmolecule分子．A moleculeisagroupofatoms原子heldtogetherbychemicalbonds．Molecules come{{U}}?55?{{/U}}allshapesandsizesandmakeup{{U}}?56 ?{{/U}}youcanseetouchorfeel．Howamoleculebehavesdependson {{U}}?57?{{/U}}kindsofatomsitcontainsandhowthey’reheld together．??Whenapolymer聚合物containingacolor-changing moleculecalledamechanophore机械响应性聚合物isabouttobreakitproducesa{{U}} ?58?{{/U}}．Whenapolymerwithmechanophoremolecules becomesinjuredor{{U}}?59?{{/U}}oneofthemechanophorebonds{{U}} ?60?{{/U}}andthematerialturnsred．It’sareallysimpledetection methodsaysNancySottosoneofthescientistswhoworkedontheproject．Sottos andherteamtestedthecolor-changingpolymersintheirlab．Thetest{{U}} ?61?{{/U}}provedencouraging．??Thereisawaytoget ridoftheredcolorlight．Whenabrightlightisshoneonthemechanophorethe brokenbondisfixed-andtheredcolor{{U}}?62 ?{{/U}}．Thisself-healingmaybeaproblemforengineers．Theyneedtousethe color-changerinbigconstructionprojectsthatwillbe{{U}}?63{{/U}}in sunlight．Andsunlightwillmakethemechanophore’swarningsystem{{U}}?64 ?{{/U}}．??Sottosandherfellowscientistsstillhave{{U}} ?65?{{/U}}worktodobeforethecolor-changingmoleculescanbeused outsidethelab．
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{{*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 ?? AGreatQuakeComing?? ?EveryonewholivesinSanFranciscoknowsthatearthquakesarecommonin theBayArea-andtheycanbedevastating．In1906forexampleamajorquake destroyedabout28000buildingsandkilledhundredsperhapsthousandsof people．ResidentsnowwonderwhenthenextBigOnewillstrike．It’sboundto happensomeday．Atleastsevenactivefault断层linesrunthroughtheSan Franciscoarea．FaultsareplaceswherepiecesofEarth’scrust地壳slidepast eachother．Whenthesepiecesslipthegroundshakes．??Toprepare forthatdayscientistsareusingnewtechniquestoreanalyzethe1906 earthquakeandpredicthowbadthedamagemightbewhenthenextonehappens． ??Onenewfindingaboutthe1906quakeisthattheSanAndreas Faultsplitapartfasterthanscientistshadassumedatthetime．Duringsmall earthquakesfaultsrupture断裂atabout2.7kilometerspersecond．Duringbigger quakeshoweverrupturescanhappenatratesfasterthan3.5kilometersper second．??Atsuchhighspeedsmassiveamountsofpressurebuild upgeneratingundergroundwavesthatcancausemoredamagethanthequake itself．LuckyforSanFranciscothesepressurepulses脉冲traveledawayfromthe cityduringthe1906event．Asbadasthedamagewasitcouldhavebeenfar worse．??Lookingaheadscientistsaretryingtopredictwhenthe nextmajorquakewilloccur．Recordsshowthatearthquakeswerecommonbefore 1906．Sincethentheareahasbeenrelativelyquiet．Patternsinthe datahoweversuggestthattheprobabilityofamajorearthquakestrikingtheBay Areabefore2032isatleast62percent．??NewbuildingsinSan Franciscoarequitesafeincaseoffuturequakes．Stillmorethan84percentof thecity’sbuildingsareoldandweak．Analysessuggestthatanothermassive earthquakewouldcauseextensivedamage．??Peoplewholivethere todaytendtofeelsafebecauseSanFranciscohasremainedprettyquietfora while．Accordingtothenewresearchhoweverit’snotamatterofiftheBigOne willhit．It’sjustamatterofwhen．Scientistswillbeabletopredicttheexacttimeofanearthquakesoon．
{{*HTML*}}{{B}}第二篇{{/B}} SharingSilence??Deaf teenagersOrlandoChavezandGermanResendizhavebeenfriendssince kindergarten幼儿园．TogetherthetwoboyswhogotoEscondidoHighSchoolin Californiahavehadthedifficultjoboflearninginschoolswherethemajority ofthestudentscanspeakandhear．??Orlandolosthishearingat theageofone．GermanwasborndeafandhisparentsmovedfromMexicotofinda schoolwherehecouldlearnsignlanguage．HemetOrlandoontheirfirstdayof kindergarten．??Wewereinaspecialclasswithabout25other deafkidsGermanremembers．BeforethenIdidn’tknowIwasdeafandthatIwas different．??Beingyounganddeafinregularclasseswasvery hardsignsOrlando．Theotherkidsdidn’tunderstandusandwedidn’t understandthem．ButweveallgrownuptogetherandtodayI’mpopularbecause I’mdeaf．Kidstryhardtocommunicatewithme．??Somethingsare verydifficultforthetwoboys．Wecan’ttalkonthephonesoifweneed helpwecan’tcallanemergencyserviceGermansigns．Andwecan’torderfood inadrive-thru．??Despitetheirdifficultiesthetwoboyshave foundworkputtingfoodinbagsatalocalsupermarket．Theygottheirjobs throughaworkabilityprogramdesignedforteenagersfromlocalschoolswith differenttypesoflearningdisabilities．??Germanhasworkedin thesupermarketsinceAugustandOrlandostartedinNovember．? ?TheotherpeoplewhoworkherehavebeenverynicetousOrlando signs．Theyevensignsometimes．Atfirstwewerenervousbutwe’velearneda lotandwe’regettingbetter．??Theopportunitytoearnmoney hasbeenexcitingbothboyssaid．Afterhighschooltheyhopetoattendthe NationalTechnicalInstitutefortheDeafinNewYork． Thewordemergencyinparagraph5isclosestinmeaningto
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{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 SeeingRedMeansDangerAhead? ?Thecolorredoftenmeansdanger-andbypayingattentionaccidentscanbe prevented．Inthefuturethecolorredalsomayhelp{{U}}?51 ?{{/U}}dangeratconstructionsites．Thankstonewworkbyengineersbridge supports-or{{U}}?52?{{/U}}kindsofmaterials-couldonedaycontaina color-changingmaterial．Itwillturnred{{U}}?53?{{/U}}astructure collapsesorfallsapart．??Thesecret{{U}}?54 ?{{/U}}thecolor-changingmaterialisaparticulartypeofmolecule分子．A moleculeisagroupofatoms原子heldtogetherbychemicalbonds．Molecules come{{U}}?55?{{/U}}allshapesandsizesandmakeup{{U}}?56 ?{{/U}}youcanseetouchorfeel．Howamoleculebehavesdependson {{U}}?57?{{/U}}kindsofatomsitcontainsandhowthey’reheld together．??Whenapolymer聚合物containingacolor-changing moleculecalledamechanophore机械响应性聚合物isabouttobreakitproducesa{{U}} ?58?{{/U}}．Whenapolymerwithmechanophoremolecules becomesinjuredor{{U}}?59?{{/U}}oneofthemechanophorebonds{{U}} ?60?{{/U}}andthematerialturnsred．It’sareallysimpledetection methodsaysNancySottosoneofthescientistswhoworkedontheproject．Sottos andherteamtestedthecolor-changingpolymersintheirlab．Thetest{{U}} ?61?{{/U}}provedencouraging．??Thereisawaytoget ridoftheredcolorlight．Whenabrightlightisshoneonthemechanophorethe brokenbondisfixed-andtheredcolor{{U}}?62 ?{{/U}}．Thisself-healingmaybeaproblemforengineers．Theyneedtousethe color-changerinbigconstructionprojectsthatwillbe{{U}}?63{{/U}}in sunlight．Andsunlightwillmakethemechanophore’swarningsystem{{U}}?64 ?{{/U}}．??Sottosandherfellowscientistsstillhave{{U}} ?65?{{/U}}worktodobeforethecolor-changingmoleculescanbeused outsidethelab．
{{*HTML*}}下面有3篇短文每篇短文后有5道题请根据短文内容为每题确定1个最佳选项{{B}}第一篇{{/B}} ArcticMelt??Earth’s NorthandSouthPolesarefamousforbeingcoldandicy．Lastyearhoweverthe amountoficeintheArcticOcean北冰洋felltoarecordlow．? ?NormallyicebuildsinArcticwatersaroundtheNorthPoleeachwinterand shrinks缩小duringthesummer．Butformanyyearstheamountoficeleftbythe endofsummerhasbeendeclining．??Since1979eachdecadehas seenan11.4percentdropinend-of-summericecover．Between1981and2000．ice intheArcticlost22percentofitsthickness-becoming1.13metersthinner． ??LastsummerArcticseaicereacheditsthinnestlevelsyet．By theendofsummer2007theicehadshrunktocoverjust4.2millionsquare kilometers．That’s38percentlessareathantheaveragecoveratthattimeof year．Andit’saverylarge23percentbelowthepreviousrecordlowwhichwas setjust2yearsago．Thiscontinuingtrendhasmadescientistsconcerned． ??TheremaybeseveralreasonsfortheicemeltsaysJinlun Zhanganoceanographer海洋学家attheUniversityofWashingtoninSeattle．Unusually strongwindsblewthroughtheArcticlastsummer．Thewindspushedmuchofthe iceoutofthecentralArctic．1eavingalargeareaofthiniceandopenwater． ??ScientistsalsosuspectthatfewercloudscovertheArcticnow thaninthepast．Clearerskiesallowmoresunlighttoreachtheocean．Theextra heatwarmsboththewaterandtheatmosphere．InpartsoftheArcticOceanlast yearsurfacetemperatureswere3.5?Celsiuswarmerthanaverageand1.5℃warmer thanthepreviousrecordhigh．??Withbothairandwatergetting warmertheiceismeltingfrombothaboveandbelow．Insomepartsofthe BeaufortSeanorthofAlaskaandwesternCanadaicethatmeasured3.3meters thickatthebeginningofthesummermeasuredjust50cmbyseason’send． ??Thenewmeasurementssuggestthatmeltingisfarmoresevere thanscientistshaveseenbyjustlookingaticecoverfromabove．Some scientistsfearthattheArcticisstuckinawarmingtrendfromwhichitmay neverrecover．Thewordbuildsinparagraph2couldbebestreplacedby
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{{*HTML*}}A．anecessity??B．anemergency??C．anumber ofnewheadaches??D．familyarguments??E．bigand lightpalm-sizedmodels??F．countlessnewfacilitiesWecanusecellphonestocommunicatewithothorswhenweencounter______．
{{*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 ?? AGreatQuakeComing?? ?EveryonewholivesinSanFranciscoknowsthatearthquakesarecommonin theBayArea-andtheycanbedevastating．In1906forexampleamajorquake destroyedabout28000buildingsandkilledhundredsperhapsthousandsof people．ResidentsnowwonderwhenthenextBigOnewillstrike．It’sboundto happensomeday．Atleastsevenactivefault断层linesrunthroughtheSan Franciscoarea．FaultsareplaceswherepiecesofEarth’scrust地壳slidepast eachother．Whenthesepiecesslipthegroundshakes．??Toprepare forthatdayscientistsareusingnewtechniquestoreanalyzethe1906 earthquakeandpredicthowbadthedamagemightbewhenthenextonehappens． ??Onenewfindingaboutthe1906quakeisthattheSanAndreas Faultsplitapartfasterthanscientistshadassumedatthetime．Duringsmall earthquakesfaultsrupture断裂atabout2.7kilometerspersecond．Duringbigger quakeshoweverrupturescanhappenatratesfasterthan3.5kilometersper second．??Atsuchhighspeedsmassiveamountsofpressurebuild upgeneratingundergroundwavesthatcancausemoredamagethanthequake itself．LuckyforSanFranciscothesepressurepulses脉冲traveledawayfromthe cityduringthe1906event．Asbadasthedamagewasitcouldhavebeenfar worse．??Lookingaheadscientistsaretryingtopredictwhenthe nextmajorquakewilloccur．Recordsshowthatearthquakeswerecommonbefore 1906．Sincethentheareahasbeenrelativelyquiet．Patternsinthe datahoweversuggestthattheprobabilityofamajorearthquakestrikingtheBay Areabefore2032isatleast62percent．??NewbuildingsinSan Franciscoarequitesafeincaseoffuturequakes．Stillmorethan84percentof thecity’sbuildingsareoldandweak．Analysessuggestthatanothermassive earthquakewouldcauseextensivedamage．??Peoplewholivethere todaytendtofeelsafebecauseSanFranciscohasremainedprettyquietfora while．Accordingtothenewresearchhoweverit’snotamatterofiftheBigOne willhit．It’sjustamatterofwhen．EarthquakesrarelyhappenedinSanFranciscobefore1906．
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 SeeingRedMeansDangerAhead? ?Thecolorredoftenmeansdanger-andbypayingattentionaccidentscanbe prevented．Inthefuturethecolorredalsomayhelp{{U}}?51 ?{{/U}}dangeratconstructionsites．Thankstonewworkbyengineersbridge supports-or{{U}}?52?{{/U}}kindsofmaterials-couldonedaycontaina color-changingmaterial．Itwillturnred{{U}}?53?{{/U}}astructure collapsesorfallsapart．??Thesecret{{U}}?54 ?{{/U}}thecolor-changingmaterialisaparticulartypeofmolecule分子．A moleculeisagroupofatoms原子heldtogetherbychemicalbonds．Molecules come{{U}}?55?{{/U}}allshapesandsizesandmakeup{{U}}?56 ?{{/U}}youcanseetouchorfeel．Howamoleculebehavesdependson {{U}}?57?{{/U}}kindsofatomsitcontainsandhowthey’reheld together．??Whenapolymer聚合物containingacolor-changing moleculecalledamechanophore机械响应性聚合物isabouttobreakitproducesa{{U}} ?58?{{/U}}．Whenapolymerwithmechanophoremolecules becomesinjuredor{{U}}?59?{{/U}}oneofthemechanophorebonds{{U}} ?60?{{/U}}andthematerialturnsred．It’sareallysimpledetection methodsaysNancySottosoneofthescientistswhoworkedontheproject．Sottos andherteamtestedthecolor-changingpolymersintheirlab．Thetest{{U}} ?61?{{/U}}provedencouraging．??Thereisawaytoget ridoftheredcolorlight．Whenabrightlightisshoneonthemechanophorethe brokenbondisfixed-andtheredcolor{{U}}?62 ?{{/U}}．Thisself-healingmaybeaproblemforengineers．Theyneedtousethe color-changerinbigconstructionprojectsthatwillbe{{U}}?63{{/U}}in sunlight．Andsunlightwillmakethemechanophore’swarningsystem{{U}}?64 ?{{/U}}．??Sottosandherfellowscientistsstillhave{{U}} ?65?{{/U}}worktodobeforethecolor-changingmoleculescanbeused outsidethelab．
{{*HTML*}}下面有3篇短文每篇短文后有5道题请根据短文内容为每题确定1个最佳选项{{B}}第一篇{{/B}} ArcticMelt??Earth’s NorthandSouthPolesarefamousforbeingcoldandicy．Lastyearhoweverthe amountoficeintheArcticOcean北冰洋felltoarecordlow．? ?NormallyicebuildsinArcticwatersaroundtheNorthPoleeachwinterand shrinks缩小duringthesummer．Butformanyyearstheamountoficeleftbythe endofsummerhasbeendeclining．??Since1979eachdecadehas seenan11.4percentdropinend-of-summericecover．Between1981and2000．ice intheArcticlost22percentofitsthickness-becoming1.13metersthinner． ??LastsummerArcticseaicereacheditsthinnestlevelsyet．By theendofsummer2007theicehadshrunktocoverjust4.2millionsquare kilometers．That’s38percentlessareathantheaveragecoveratthattimeof year．Andit’saverylarge23percentbelowthepreviousrecordlowwhichwas setjust2yearsago．Thiscontinuingtrendhasmadescientistsconcerned． ??TheremaybeseveralreasonsfortheicemeltsaysJinlun Zhanganoceanographer海洋学家attheUniversityofWashingtoninSeattle．Unusually strongwindsblewthroughtheArcticlastsummer．Thewindspushedmuchofthe iceoutofthecentralArctic．1eavingalargeareaofthiniceandopenwater． ??ScientistsalsosuspectthatfewercloudscovertheArcticnow thaninthepast．Clearerskiesallowmoresunlighttoreachtheocean．Theextra heatwarmsboththewaterandtheatmosphere．InpartsoftheArcticOceanlast yearsurfacetemperatureswere3.5?Celsiuswarmerthanaverageand1.5℃warmer thanthepreviousrecordhigh．??Withbothairandwatergetting warmertheiceismeltingfrombothaboveandbelow．Insomepartsofthe BeaufortSeanorthofAlaskaandwesternCanadaicethatmeasured3.3meters thickatthebeginningofthesummermeasuredjust50cmbyseason’send． ??Thenewmeasurementssuggestthatmeltingisfarmoresevere thanscientistshaveseenbyjustlookingaticecoverfromabove．Some scientistsfearthattheArcticisstuckinawarmingtrendfromwhichitmay neverrecover．Itcanbelearnedfromthelastsentencethat
{{*HTML*}}下面有3篇短文每篇短文后有5道题请根据短文内容为每题确定1个最佳选项{{B}}第一篇{{/B}} ArcticMelt??Earth’s NorthandSouthPolesarefamousforbeingcoldandicy．Lastyearhoweverthe amountoficeintheArcticOcean北冰洋felltoarecordlow．? ?NormallyicebuildsinArcticwatersaroundtheNorthPoleeachwinterand shrinks缩小duringthesummer．Butformanyyearstheamountoficeleftbythe endofsummerhasbeendeclining．??Since1979eachdecadehas seenan11.4percentdropinend-of-summericecover．Between1981and2000．ice intheArcticlost22percentofitsthickness-becoming1.13metersthinner． ??LastsummerArcticseaicereacheditsthinnestlevelsyet．By theendofsummer2007theicehadshrunktocoverjust4.2millionsquare kilometers．That’s38percentlessareathantheaveragecoveratthattimeof year．Andit’saverylarge23percentbelowthepreviousrecordlowwhichwas setjust2yearsago．Thiscontinuingtrendhasmadescientistsconcerned． ??TheremaybeseveralreasonsfortheicemeltsaysJinlun Zhanganoceanographer海洋学家attheUniversityofWashingtoninSeattle．Unusually strongwindsblewthroughtheArcticlastsummer．Thewindspushedmuchofthe iceoutofthecentralArctic．1eavingalargeareaofthiniceandopenwater． ??ScientistsalsosuspectthatfewercloudscovertheArcticnow thaninthepast．Clearerskiesallowmoresunlighttoreachtheocean．Theextra heatwarmsboththewaterandtheatmosphere．InpartsoftheArcticOceanlast yearsurfacetemperatureswere3.5?Celsiuswarmerthanaverageand1.5℃warmer thanthepreviousrecordhigh．??Withbothairandwatergetting warmertheiceismeltingfrombothaboveandbelow．Insomepartsofthe BeaufortSeanorthofAlaskaandwesternCanadaicethatmeasured3.3meters thickatthebeginningofthesummermeasuredjust50cmbyseason’send． ??Thenewmeasurementssuggestthatmeltingisfarmoresevere thanscientistshaveseenbyjustlookingaticecoverfromabove．Some scientistsfearthattheArcticisstuckinawarmingtrendfromwhichitmay neverrecover．WhatmaybesomeofthereasonsfortheicemeltintheArctic?
{{*HTML*}}{{B}}第三篇{{/B}} WalkingtoExercisetheBrain? ?Doyouthinksittingandstudyingallthetimewillimprove students’grades?Thinkagain．Gettingsomeexercisemayhelptoo．? ?Newresearchwitholderpeoplesuggeststhattakingregularwalkshelps thempayattentionbetterthaniftheydidn’texercise．? ?Previousresearchhadshownthatmicelearnrememberandpayattention betterafterafewweeksofworkingoutonarunningwheel．Micethatexercise havegreaterbloodflowtothebrainthanthosewhodon’t．Theirbraincellsalso makemoreconnections．??Neuroscientists神经科学家fromthe UniversityofIllinoisatUrbana-Champaignwantedtofindoutifthesamething istrueforpeople．Firsttheymeasuredthephysicalfitnessof41adultsages58 to77aftereachpersonwalked1mile．Thenparticipantslookedatarrowsona computerscreenandhadtousecomputerkeystoshowwhichwayoneparticular arrowwaspointing．??Adultswhowerephysicallyfitwerefaster atthearrowtaskandtheiranswerswerejustasaccurateastheirless-fit peerstheresearchersfound．Thefitterparticipantsalsohadmorebloodflowto apartoftheirbrainresponsibleforpayingattentionandmakingdecisions． ??Inasecondstudy15elderlypeoplewhocompleteda6-month aerobic-training有氧运动coursewerefasteratattentiontaskscomparedwith14 seniorswhojustdidstretchingandtoning韵律操exercisesforthesameamountof time.??Soevengoingforawalkevery2or3daysforjust10to 45minutescanhelp．Thatshouldbegoodnewsfortheelderly．? ?Theeffectsofexercisingonthebrainsofyoungerpeoplehaven’tbeen studiedyet．Stillitcan’thurttotakeoccasionalbreaksandgoforawalkor runaroundwithfriends．Whateveryoudothoughdon’ttrytoreadandwalkatthe sametime．Youcouldenduphurtingyourself!Thefirststudyon41elderlypeoplefound
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 SeeingRedMeansDangerAhead? ?Thecolorredoftenmeansdanger-andbypayingattentionaccidentscanbe prevented．Inthefuturethecolorredalsomayhelp{{U}}?51 ?{{/U}}dangeratconstructionsites．Thankstonewworkbyengineersbridge supports-or{{U}}?52?{{/U}}kindsofmaterials-couldonedaycontaina color-changingmaterial．Itwillturnred{{U}}?53?{{/U}}astructure collapsesorfallsapart．??Thesecret{{U}}?54 ?{{/U}}thecolor-changingmaterialisaparticulartypeofmolecule分子．A moleculeisagroupofatoms原子heldtogetherbychemicalbonds．Molecules come{{U}}?55?{{/U}}allshapesandsizesandmakeup{{U}}?56 ?{{/U}}youcanseetouchorfeel．Howamoleculebehavesdependson {{U}}?57?{{/U}}kindsofatomsitcontainsandhowthey’reheld together．??Whenapolymer聚合物containingacolor-changing moleculecalledamechanophore机械响应性聚合物isabouttobreakitproducesa{{U}} ?58?{{/U}}．Whenapolymerwithmechanophoremolecules becomesinjuredor{{U}}?59?{{/U}}oneofthemechanophorebonds{{U}} ?60?{{/U}}andthematerialturnsred．It’sareallysimpledetection methodsaysNancySottosoneofthescientistswhoworkedontheproject．Sottos andherteamtestedthecolor-changingpolymersintheirlab．Thetest{{U}} ?61?{{/U}}provedencouraging．??Thereisawaytoget ridoftheredcolorlight．Whenabrightlightisshoneonthemechanophorethe brokenbondisfixed-andtheredcolor{{U}}?62 ?{{/U}}．Thisself-healingmaybeaproblemforengineers．Theyneedtousethe color-changerinbigconstructionprojectsthatwillbe{{U}}?63{{/U}}in sunlight．Andsunlightwillmakethemechanophore’swarningsystem{{U}}?64 ?{{/U}}．??Sottosandherfellowscientistsstillhave{{U}} ?65?{{/U}}worktodobeforethecolor-changingmoleculescanbeused outsidethelab．
{{*HTML*}}下面的短文有15处空白请根据短文内容为每处空白确定1个最佳选项 SeeingRedMeansDangerAhead? ?Thecolorredoftenmeansdanger-andbypayingattentionaccidentscanbe prevented．Inthefuturethecolorredalsomayhelp{{U}}?51 ?{{/U}}dangeratconstructionsites．Thankstonewworkbyengineersbridge supports-or{{U}}?52?{{/U}}kindsofmaterials-couldonedaycontaina color-changingmaterial．Itwillturnred{{U}}?53?{{/U}}astructure collapsesorfallsapart．??Thesecret{{U}}?54 ?{{/U}}thecolor-changingmaterialisaparticulartypeofmolecule分子．A moleculeisagroupofatoms原子heldtogetherbychemicalbonds．Molecules come{{U}}?55?{{/U}}allshapesandsizesandmakeup{{U}}?56 ?{{/U}}youcanseetouchorfeel．Howamoleculebehavesdependson {{U}}?57?{{/U}}kindsofatomsitcontainsandhowthey’reheld together．??Whenapolymer聚合物containingacolor-changing moleculecalledamechanophore机械响应性聚合物isabouttobreakitproducesa{{U}} ?58?{{/U}}．Whenapolymerwithmechanophoremolecules becomesinjuredor{{U}}?59?{{/U}}oneofthemechanophorebonds{{U}} ?60?{{/U}}andthematerialturnsred．It’sareallysimpledetection methodsaysNancySottosoneofthescientistswhoworkedontheproject．Sottos andherteamtestedthecolor-changingpolymersintheirlab．Thetest{{U}} ?61?{{/U}}provedencouraging．??Thereisawaytoget ridoftheredcolorlight．Whenabrightlightisshoneonthemechanophorethe brokenbondisfixed-andtheredcolor{{U}}?62 ?{{/U}}．Thisself-healingmaybeaproblemforengineers．Theyneedtousethe color-changerinbigconstructionprojectsthatwillbe{{U}}?63{{/U}}in sunlight．Andsunlightwillmakethemechanophore’swarningsystem{{U}}?64 ?{{/U}}．??Sottosandherfellowscientistsstillhave{{U}} ?65?{{/U}}worktodobeforethecolor-changingmoleculescanbeused outsidethelab．
{{*HTML*}}A．anecessity??B．anemergency??C．anumber ofnewheadaches??D．familyarguments??E．bigand lightpalm-sizedmodels??F．countlessnewfacilitiesNowadayscellphonesareequippedwith______．
{{*HTML*}}{{B}}第三篇{{/B}} WalkingtoExercisetheBrain? ?Doyouthinksittingandstudyingallthetimewillimprove students’grades?Thinkagain．Gettingsomeexercisemayhelptoo．? ?Newresearchwitholderpeoplesuggeststhattakingregularwalkshelps thempayattentionbetterthaniftheydidn’texercise．? ?Previousresearchhadshownthatmicelearnrememberandpayattention betterafterafewweeksofworkingoutonarunningwheel．Micethatexercise havegreaterbloodflowtothebrainthanthosewhodon’t．Theirbraincellsalso makemoreconnections．??Neuroscientists神经科学家fromthe UniversityofIllinoisatUrbana-Champaignwantedtofindoutifthesamething istrueforpeople．Firsttheymeasuredthephysicalfitnessof41adultsages58 to77aftereachpersonwalked1mile．Thenparticipantslookedatarrowsona computerscreenandhadtousecomputerkeystoshowwhichwayoneparticular arrowwaspointing．??Adultswhowerephysicallyfitwerefaster atthearrowtaskandtheiranswerswerejustasaccurateastheirless-fit peerstheresearchersfound．Thefitterparticipantsalsohadmorebloodflowto apartoftheirbrainresponsibleforpayingattentionandmakingdecisions． ??Inasecondstudy15elderlypeoplewhocompleteda6-month aerobic-training有氧运动coursewerefasteratattentiontaskscomparedwith14 seniorswhojustdidstretchingandtoning韵律操exercisesforthesameamountof time.??Soevengoingforawalkevery2or3daysforjust10to 45minutescanhelp．Thatshouldbegoodnewsfortheelderly．? ?Theeffectsofexercisingonthebrainsofyoungerpeoplehaven’tbeen studiedyet．Stillitcan’thurttotakeoccasionalbreaksandgoforawalkor runaroundwithfriends．Whateveryoudothoughdon’ttrytoreadandwalkatthe sametime．Youcouldenduphurtingyourself!Walkingregularlyhelpselderlypeople
Whataremychancesof{{U}}promotion{{/U}}ifIstayhere?
{{*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 ?? AGreatQuakeComing?? ?EveryonewholivesinSanFranciscoknowsthatearthquakesarecommonin theBayArea-andtheycanbedevastating．In1906forexampleamajorquake destroyedabout28000buildingsandkilledhundredsperhapsthousandsof people．ResidentsnowwonderwhenthenextBigOnewillstrike．It’sboundto happensomeday．Atleastsevenactivefault断层linesrunthroughtheSan Franciscoarea．FaultsareplaceswherepiecesofEarth’scrust地壳slidepast eachother．Whenthesepiecesslipthegroundshakes．??Toprepare forthatdayscientistsareusingnewtechniquestoreanalyzethe1906 earthquakeandpredicthowbadthedamagemightbewhenthenextonehappens． ??Onenewfindingaboutthe1906quakeisthattheSanAndreas Faultsplitapartfasterthanscientistshadassumedatthetime．Duringsmall earthquakesfaultsrupture断裂atabout2.7kilometerspersecond．Duringbigger quakeshoweverrupturescanhappenatratesfasterthan3.5kilometersper second．??Atsuchhighspeedsmassiveamountsofpressurebuild upgeneratingundergroundwavesthatcancausemoredamagethanthequake itself．LuckyforSanFranciscothesepressurepulses脉冲traveledawayfromthe cityduringthe1906event．Asbadasthedamagewasitcouldhavebeenfar worse．??Lookingaheadscientistsaretryingtopredictwhenthe nextmajorquakewilloccur．Recordsshowthatearthquakeswerecommonbefore 1906．Sincethentheareahasbeenrelativelyquiet．Patternsinthe datahoweversuggestthattheprobabilityofamajorearthquakestrikingtheBay Areabefore2032isatleast62percent．??NewbuildingsinSan Franciscoarequitesafeincaseoffuturequakes．Stillmorethan84percentof thecity’sbuildingsareoldandweak．Analysessuggestthatanothermassive earthquakewouldcauseextensivedamage．??Peoplewholivethere todaytendtofeelsafebecauseSanFranciscohasremainedprettyquietfora while．Accordingtothenewresearchhoweverit’snotamatterofiftheBigOne willhit．It’sjustamatterofwhen．The1906earthquakeinSanFranciscoisthemostsevereoneinAmericanhistory．
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