2024年全国成考（专升本）之英语（专升本）考试重点试题附答案

姓名:_________________编号:_________________地区:_________________省市:_________________ 密封线 姓名:_________________编号:_________________地区:_________________省市:_________________ 密封线 密封线 全国成考（专升本）考试重点试题精编注意事项:1.全卷采用机器阅卷，请考生注意书写规范；考试时间为120分钟。2.在作答前，考生请将自己的学校、姓名、班级、准考证号涂写在试卷和答题卡规定位置。

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1、MaryAnning(1799-1874)wasaBritishfossilhunterwhobeganfinding21child,andsoonsupportedherselfandhervery22familybyfindingandsellingfossils.Very23isknownaboutherlife,butherfatherwasacabinetmakerandhealso24localfossils.Mary25onthesoutherncoastofEngland,inatowncalledLymeRegis.Itsfamous26bytheseacontain27fossillayersthat28fromtheTriassic,JurassicandCretaceousperiods(the29ofthedinosaurs,otherbizarrereptiles,largeinsects,seacreatures,30mammals,and31lifeforms).MaryAnning32andpreparedthefirstfossilizedplesiosaur(anocean-dwellingreptile)andthefirstIchthyosaurus(anocean-dwellingreptilethat33likeadolphin).Shefoundmanyotherimportantfossils,includingPterodactylus(aflyingreptile),sharks(andotherfish),andsoon.34withherbrotherJoseph,Marysuppliedpreparedfossilspecimens35museums,scientists,andprivatecollections.A.periodB.dateC.startedD.beginning

2、Tom________thecaraccidentifhehadn'tdrunkalcoholbeforedriving.A.wouldavoidB.avoidedC.wouldhaveavoidedD.willavoid

3、Sheisillbutshe____ofthecompany.（）A.isstillinchargeB.stillinthechargeC.isstillunderthechargeD.stillcharge

4、Allthehousewiveswhowenttothenewsupermarkethadonegreatambition:tobetheluckycustomerwhodidnothavetopayforhershopping.Forthiswaswhatthenoticejustinsidetheentrancepromised.Itsaid:“Remember,onceaweek,oneofourcustomersgetsfreegoods.ThisMayBeYourLuckyDay!”ForseveralweeksMrs.Edwardshoped,likemanyofherfriends,tobetheluckycustomer.Unlikeherfriends,shenevergaveuphoping.Thecupboardsinkitchenwerefullofthingswhichshedidnotneed．Herhusbandtriedtoadviseheragainstbuyingthingsbutfailed.Shedreamedofthedaywhenthemanagerofthesupermarketwouldapproachherandsay,“Madam,thisisYourLuckyDay.Everythinginyourbasketisfree.”OneFridaymorning,aftershehadfinishedhershoppingandhadtakenittohercar,shefoundthatshehadforgottentobuyanytea.Shedashedbacktothesupermarket,gottheteaandwenttowardsthecash-desk.Asshedidso,shesawthemanagerofthesupermarketapproachher.“Madam,”hesaid,holdingouthishand,“Iwanttocongratulateyou!Youareourluckycustomerandeverythingyouhaveinyourbasketisfree!”Mrs.Edwards'husbandtriedto____.（）A.makeherunhappyB.cheerherupC.buythingswithherD.stopherbuyingthings

5、Well,let′sputourheadstogetherandfinda（n）__________totheproblem.A.measureB.wayC.solutionD.method

6、Allthehousewiveswhowenttothenewsupermarkethadonegreatambition:tobetheluckycustomerwhodidnothavetopayforhershopping.Forthiswaswhatthenoticejustinsidetheentrancepromised.Itsaid:“Remember,onceaweek,oneofourcustomersgetsfreegoods.ThisMayBeYourLuckyDay!”ForseveralweeksMrs.Edwardshoped,likemanyofherfriends,tobetheluckycustomer.Unlikeherfriends,shenevergaveuphoping.Thecupboardsinkitchenwerefullofthingswhichshedidnotneed．Herhusbandtriedtoadviseheragainstbuyingthingsbutfailed.Shedreamedofthedaywhenthemanagerofthesupermarketwouldapproachherandsay,“Madam,thisisYourLuckyDay.Everythinginyourbasketisfree.”OneFridaymorning,aftershehadfinishedhershoppingandhadtakenittohercar,shefoundthatshehadforgottentobuyanytea.Shedashedbacktothesupermarket,gottheteaandwenttowardsthecash-desk.Asshedidso,shesawthemanagerofthesupermarketapproachher.“Madam,”hesaid,holdingouthishand,“Iwanttocongratulateyou!Youareourluckycustomerandeverythingyouhaveinyourbasketisfree!”WhichstatementisTRUE?（）A.Mrs.EdwardsisalwaysveryluckyB.Mrs.EdwardshadnofriendsC.Mrs.EdwardshopedtogetfreeshoppingD.Mrs.Edwardsgetsdisappointedeasily

7、Youreallyhavetogetveryoldbeforeyourealizeyou'reold.I'minmymiddlefiftiesandIdon'tfeel21yet.However,sometimesIlookbackatmychildhoodand_22thingstothewaylifeisfor23kids,somethingshavecertainlychanged.Oneareaofchangeis24.Somechangeshavebeenimprovements.Somechanges,ontheotherhand,havebeen25.WhenIstartedschool,mostpeopledidn'thaveatelevision;TVwasjustbeginningtoget26.Myfatherdecidedtogoalloutandbuya16-inchblackandwhiteMotorola27.IstillrememberwatchingtheLoneRangersavepeople,fromthe28guysonthatawesomeelectronicmachine.Thatwasexciting!Now,29havelargerpicturesinfullcolor.Thepicturesareclearerandthesoundismuchmore30.Thenewhighdefinitionsetsaremadetorival31screens.Thevarietyandquantityofprogramhas32greatly.Therearehundredsofchannelsandmoreshowsthanonepersoncouldeverwatch.Therearemanyfineentertainmentandeducational33.There'salsoalotofgarbage,stuffthatmost34don'twanttheirkidsexposedto.Overall,wehavemorechoices,andthatisgood.Iwonderwhat35willbelikewhentoday'skidsaremyage．A.declinedB.increasedC.fellD.played

8、HaveyoueverhadtodecidewhethertogoshoppingorstayhomeandwatchTVonaweekend?Nowyou_____21_____dobothatthesametime.Homeshoppingtelevisionnetworks(网络)havebecome?a_____22_____formanypeopletoshopwithout_____23_____havingtoleavetheirhome.Someshoppersare_____24_____ofdepartmentstoresandsupermarkets——fightingthecrowds,waiting?inlonglines,andsometimeshavingslight_____25_____offindinganythingtheywanttobuy.They′d?rathersitquietlyathomeinfrontoftheTVsetandwatchafriendlyannouncerdescribeaproduct_____26_____amodelshowsit.Andtheycanshoparoundtheclock,buyingsomething_____27_____bymakingaphonecall.Departmentstoresandevenmail-ordercompaniesare_____28_____tojoininthesuccessofhome?shopping.Largedepartmentstoresarebusy_____29_____theirownTVchannels(频道)toencourageTVshoppinginthefuture.Customerscanaskquestionsaboutproductsandplace_____30_____,allthroughtheirTVsets.Willshoppingbytelevision_____31_____taketheplaceofshoppinginstores?Someindustrymangersthinkso._____32_____manypeoplefindshoppingatarealstoreagreatenjoyment.Andformanyshoppers,itisstillimportantto_____33_____ortryondressestheywanttobuy.That′s_____34_____specialismsaythatinthefuture,homeshoppingwill_____35_____togetherwithstoreshoppingbutwillneverentirelyreplaceit.

9、Forsometimepast,ithasbeenwidelyacceptedthatbabiesandothercreatureslearntodothingsbecausecertainactsleadto“rewards”;andthereisnoreasontodoubtthatthisistrue.Butitusedalsotobewidelybelievedthateffectiverewards,atleastintheearlystages,hadtobedirectlyrelatedtosuchbasicphysiological“drives”asthirstorhunger.Inotherwords,ababywouldlearnifhegotfoodordrinkorsomesortofphysicalcomfort,nototherwise.Itisnowclearthatthisisnotso.Babieswilllearntobehaveinwaysthatproduceresultsintheworldwithnorewardexceptthesuccessfuloutcome.Papousekbeganhisstudiesbyusingmilkinthenormalwayto“reward”thebabiesandsoteachthemtocarryoutsomesimplemovements,suchasturningtheheadtoonesideortheother.Thenhenoticedthatababywhohadenoughtodrinkwouldrefusethemilkbutwouldstillgoonmakingthelearnedresponsewithclearsignsofpleasure.Sohebegantostudythechildren'sresponsesinsituationswherenomilkwasprovided.Hequicklyfoundthatchildrenasyoungasfourmonthswouldlearntoturntheirheadstorightorleftifthemovement“switchedon”adisplayoflights—andindeedthattheywerecapableoflearningquitecomplexturnstobringaboutthisresult.Forinstance,twoleftortworight,oreventomakeasmanyasthreeturnstooneside.Papousek'slightdisplaywasplaceddirectlyinfrontofthebabiesandhemadetheinterestingobservationthatsometimestheywouldnotturnbacktowatchthelightscloselyalthoughtheywould“smileandbubble”whenthedisplaycameon.Papousekconcludedthatitwasnotprimarilythesightofthelightswhichpleasedthem,itwasthesuccesstheywereachievinginsolvingtheproblem,inmasteringtheskill,andthatthereexistsafundamentalhumanurgetomakesenseoftheworldandbringitunderintentionalcontrol.Thebabieswould“smileandbubble”atthelightsbecause____.（）A.thelightsweredirectlyrelatedtosomebasic“drives”B.thesightofthelightswasinterestingC.theyneednotturnbacktowatchthelightsD.theysucceededin“switchingon”thelights

10、PassageTwoEveryyearjustafterChristmastheJanuarySalesstart.Alltheshopsreducetheirpricesandfortwoweeks,theyarefullofpeoplelookingforbargains.MyhusbandandIdonotnormallygotothesalesaswedon′tlikecrowdsandinanycaseareshortofmoneyaswehavetobuylotsofChristmaspresents.Lastyear,however,ItookmyhusbandwithmetothesalesatthelargeshopinthecenterofLondon.Webothneededsomenewclothesandwerehopingtofindatelevisionset.WhenwegottoOxfordStreet,itwassocrowdedthatwedecidedtosplitupandmeetagainattheundergroundstation.SoIleftmyhusbandandstartedlookingaroundtheshops.Unfortunatelyalltheclotheswereinverylargesizesandsowerenotsuitableforme.ButIdidbuyatelevisionataverycheapprice,soIfeltquitepleasedwithmyself.WhenIarrivedatthestation,myhusbandwasnotthere.SoIsatdowninanearbycar6tohaveacupoftea.IquicklyfinishedmyteawhenIsawmyhusbandandwentouttomeethim.Helookedveryhappy.ThenIsawhewascarryingalargeandheavycardboardbox."Oh,dear!"Ithought.Yes,wehadnonewclothesbuttwotelevisions.Weshallnotbegoingtothesalesagain.Aftertheirday′sshopping,they__A.werehappywiththeirbargainsB.hadgoteverythingtheywantedC.gotmorethantheyhadhopedforD.hadtogobacktothesalesthenextday

11、ThenumberofspeakersofEnglishinShakespeare'stimeisestimatedtohavebeenaboutfivemillion.Todayitisestimatedthatsome260millionpeoplespeakitasa(an)21language,mainlyintheUnitedStates,Canada,GreatBritain,Ireland,SouthAfrica,AustraliaandNewZealand.InadditiontothestandardvarietiesofEnglishfoundintheseareas,22areagreatmanyregionalandsocialvarietiesofthelanguageaswellas23levelsofusagethatareemployedbothinitsspokenandwrittenforms.Infact,itis24toestimatethenumberofpeopleintheworldwhohaveacquiredanadequateworkingknowledgeofEnglishinadditiontotheirownlanguages.The25forEnglishlearningandthesituationsinwhichsuchlearningtakesplacearesovariedthatitis26toexplainandstillmoredifficulttojudge27formsanadequateworkingknowledgeforeachsituation.Themainreasonforthewidespread28forEnglishisitspresentdayimportanceasaworldlanguage.Besides29theindefiniteneedsofitsnativespeakers,Englishisalanguageinwhichsomeofimportantworksinscience,technology,andother30arebeingproduced,andnotalwaysbynativespeakers.Itiswidelyusedfor31purposesasmeteorological(气象的)andairportcommunications,internationalconferences,andthe32ofinformationovertheradioandtelevisionnetworksofmany33.Itisalanguageofwidercommunicationforanumberofdevelopingcountries,speciallyformerBritishcolonies.Manyofthesecountrieshavemulti-lingual34andneedalanguageforinternalcommunicationinsuchmattersasgovernment,commerce,industry,lawand35aswellasforinternationalcommunicationandforentrancetothescientificandtechnologicaldevelopmentsintheWest.A.suchB.allC.manyD.those

12、ThenumberofspeakersofEnglishinShakespeare′stimeisestimatedtohavebeenaboutfivemillion.Todayitisestimatedthatsome260millionpeoplespeakitasa(an)21?language,mainlyintheUnitedStates,Canada,GreatBritain,Ireland,SouthAfrica,AustraliaandNewZealand.InadditiontothestandardvarietiesofEnglishfoundintheseareas,22?areagreatmanyregionalandsocialvarietiesofthelanguageaswellas?23?levelsofusagethatareemployedbothinitsspokenandwrittenforms.Infact,itis?24?toestimatethenumberofpeopleintheworldwhohaveacquiredanadequateworkingknowledgeofEnglishinadditiontotheirownlanguages.The?25?forEnglishlearningandthesituationsinwhichsuchlearningtakesplacearesovariedthatitis26toexplainandstillmoredifficulttojudge?27?formsanadequateworkingknowledgeforeachsituation.Themainreasonforthewidespread?28?forEnglishisitspresentdayimportanceasaworldlanguage.Besides29theindefiniteneedsofitsnativespeakers,Englishisalanguageinwhichsomeofimportantworksinscience,technology,andother?30arebeingproduced,andnotalwaysbynativespeakers.Itiswidelyusedfor31purposesasmeteorological(气象的)andairportcommunications,internationalconferences,andthe?32?ofinformationovertheradioandtelevisionnetworksofmany?33.Itisalanguageofwidercommunicationforanumberofdevelopingcountries,speciallyformerBritishcolonies.Manyofthesecountrieshavemultilingual?34.andneedalanguageforinternalcommunicationinsuchmattersasgovernment,commerce,industry,,lawand35aswellasforinternationalcommunicationandforentrancetothescientificandtechno-logicaldevelopmentsintheWest.

13、Don'tgothereanddon'tleaveme____.（）A.aloneB.lonelyC.asideD.almost

14、Thetwoteacherstaughthim30yearsago，but_____ofthemcanrecognizehimnow.A.eitherB.noneC.eachD.neither

15、Spaceisadangerousplace,notonlybecauseofmeteorsbutalsobecauseofraysfromthesun?andotherstars.Theatmosphereagainactsasourprotectiveblanketonearth.Lightgetsthrough,and?thisisessentialforplantstomakethefoodwhichweeat.Heat,too,makesourenvironmentendurable.Variouskindsofrayscomethroughtheairfromouterspace,butenormousquantitiesofradiationfromthesunarescreenedoff.Assoonasmenleavetheatmospheretheyareexposedtothisradiation.Buttheirspacesuitsorthewallsoftheirspacecraft,iftheyareinside,dopreventalotofradiationdamage.Radiationisthegreatestknowndangertoexplorersinspace.Theunitofradiationiscalled"rein".Scientistshavereasontothinkthatamancanputupwithfarmoreradiationthan0.1rem?withoutbeingdamaged;thefigureof60remshasbeenagreedon.Thetroubleisthatitisextremely?difficulttobesureaboutradiationdamage—apersonmayfeelperfectlywell,butthecellsofhisor?hersexorgansmaybedamaged,andthiswillnotbediscovereduntilthebirthofdeformed(畸形的)childrenorevengrandchildren.MissionsoftheApolloflightshavehadtocrossbeltsofhighradiation?and,duringtheoutwardandreturnjourneys,theApollocrewaccumulatedalargeamountofrems.So?far,nodangerousamountsofradiationhavebeenreported,buttheApollomissionshavebeenquite?short.Wesimplydonotknowyethowmenaregoingtogetonwhentheyspendweeksandmonths?outsidetheprotectionoftheatmosphere,workinginaspacelaboratory.Drugsmighthelptodecrease?thedamagedonebyradiation,butnoreallyeffectiveoneshavebeenfoundsofar.Weknowfromthepassagethat__A.exposuretoeventinyamountsofradiationisfatalB.theeffectofexposuretoradiationisslowincomingC.radiationisavoidableinspaceexplorationD.astronautsinspacesuitsneedn'tworryaboutradiationdamage

16、Jimwasintelligent,buthehatedhardwork.Hesaid,“Youworkhard,andmakealotofmoney,andthenthegovernmenttakesmostofit.Iwanteasyworkthatgivesmelotsofmoneyandthatthegovernmentdoesn'tknowabout.”Sohebecameathief—buthedidnotdothestealinghimself.Hegototherstodoit.Theyweremuchlessintelligentthanhewas,sohearrangedeverythingandtoldthemwhattodo.Onedaytheywerelookingforrichfamiliestorob,andJimsentoneofthemtoalargebeautifulhousejustoutsidethetown.Itwasevening,andwhenthemanlookedthroughoneofthewindows,hesawayoungmanandagirlplayingonapiano.WhenhewentbacktoJim,hesaid,“Thatfamilycan'thavemuchmoney.Twopeoplewereplayingonthesamepianothere.”Jimdidnotdothestealinghimself,____.（）A.sohecan'tmakemoneyB.becausehewaslessintelligentthanothersC.buthemadestealingplansandgaveothersD.forhewasafoolish

17、Inancienttimeswealthwasmeasuredandexchangedinthingsthatcouldbetouched:food,tools,andpreciousmetalsandstones.Thenthebartersystemwasreplacedbycoins,whichStillhad?realvaluesincetheywerepiecesofraremetal.Coinswerefollowedbyfiatmoney,papernotesthat?havevalueonlybecauseeveryoneagreestoacceptthem.Todayelectronicmonetarysystemsaregraduallybeingintroducedthatwilltransformmoneyinto?evenlesstangibleforms,reducingittoaseriesof"bitsandbytes",orunitsofrmation,goingbetweenmachinesatthespeedoflight.′Already,electronicfundtransferallowsmoneytobe?instantlysentandreceivedbydifferentbanks,companies,andcountries?throughcomputersandtelecommunicationsdevices.Accordingtothepassage,whichofthefollowingwastheearliestkindOfexchangeofwealth?《》（）A.BarteredfoodsB.FiatmoneyC.CoincurrencyD.Intangibleforms

18、PassageThreeEverycountryhasitsheroes.Theymaybesoldiersorsportspeople,doctorsorfilmstars.Weadmirethemfortheircourage,theirstrength,theirdevotiontodutyortheirtalent.Theirexampleinspiresustolivebetter,toworkharder.TerryFoxwasayoungstudentwholovedlifeandwholovedsports.Whenhewasjust18yearsoldaterribletragedyoccurred:hisrightleghadtobecutoffbecauseofcancer.Suchanexperiencewouldhavedestroyedaweakerperson--butTerryFoxwasafighter.Herefusedtogiveup.Instead,whilehewasrecoveringfromtheoperation,anideaslowlyformedinhismind.HedecidedhewouldrunacrossCanada--inordertoraisemoneyforcancerresearch.Slowlyandcarefully,hebegantotrain.Everystepwasextremelypainful,butheinsisted,increasingthedistancecovereddaybyday.Sixteenmonthslater,inthespringof1980,hewasreadyforthelongjourneyacrossCanada--hisMarathonofHope.Itwasatimeofinspirationandheart-breakingemotion.Throughtelevision,everyhomesawhisdistinctivestyleofrunning--akindof?half-hopandhalf-run.Thousandsofpeoplelinedtheroutetoencouragehimandtowishhimwell.Theyalsogavemoneytofightcancer.Then,onSeptember1st,1980,after143daysandmorethan5,000kilometerscompleted,everythingcametragicallytoanend.Terryhadtostop.Helivedonfor?anotherninemonthsanddiedonJune28th,1981.Hewasalmost23.TerryFoxwasa___.A.studentB.moviestarC.soldierD.sportsman

19、Thepeopleatthepartyareall____athis____dance.（）A.surprised;surprisedB.surprising;surprisedC.surprised;surprisingD.surprised;surprise

20、__________atsuchatime,hisworkattractedmuchattention.A.PublishingB.BeingpublishedC.PublishedD.Whenpublished

21、ThenumberofspeakersofEnglishinShakespeare'stimeisestimatedtohavebeenaboutfivemillion.Todayitisestimatedthatsome260millionpeoplespeakitasa(an)21language,mainlyintheUnitedStates,Canada,GreatBritain,Ireland,SouthAfrica,AustraliaandNewZealand.InadditiontothestandardvarietiesofEnglishfoundintheseareas,22areagreatmanyregionalandsocialvarietiesofthelanguageaswellas23levelsofusagethatareemployedbothinitsspokenandwrittenforms.Infact,itis24toestimatethenumberofpeopleintheworldwhohaveacquiredanadequateworkingknowledgeofEnglishinadditiontotheirownlanguages.The25forEnglishlearningandthesituationsinwhichsuchlearningtakesplacearesovariedthatitis26toexplainandstillmoredifficulttojudge27formsanadequateworkingknowledgeforeachsituation.Themainreasonforthewidespread28forEnglishisitspresentdayimportanceasaworldlanguage.Besides29theindefiniteneedsofitsnativespeakers,Englishisalanguageinwhichsomeofimportantworksinscience,technology,andother30arebeingproduced,andnotalwaysbynativespeakers.Itiswidelyusedfor31purposesasmeteorological(气象的)andairportcommunications,internationalconferences,andthe32ofinformationovertheradioandtelevisionnetworksofmany33.Itisalanguageofwidercommunicationforanumberofdevelopingcountries,speciallyformerBritishcolonies.Manyofthesecountrieshavemulti-lingual34andneedalanguageforinternalcommunicationinsuchmattersasgovernment,commerce,industry,lawand35aswellasforinternationalcommunicationandforentrancetothescientificandtechnologicaldevelopmentsintheWest.A.purposeB.causeC.effectD.method

22、--IthinkyoushouldphoneJakeandsaysorrytohim.--____.Itwashisfault.（）A.NowayB.NodoorC.NochanceD.Nolonger

23、根据以下材料，回答48-51题AlanLakein,atimemanagementexpert,thinksthatnothingisatotalwasteoftime,includingdoingnothingattimes.Ifyouarrangethingssothatyoufindtimetorelaxand"donothing",youwillgetmoredoneandhavemorefundoingit.Oneofhisclients,aspaceengineer,didn'tknowhowto"donothing".Everyminuteofhisleisuretimewasscheduledwithintenseactivities.Hehadanoutdoor-activitiesscheduleinwhichheswitchedfromskiingtotennis.Hisgirlfriendkeptupwithhimintheseactivities,althoughshewouldhavepreferredjusttositbythefireandrelaxonceinawhile.Liketoomanypeople,hefelttheneedtobedoingsomethingallthetime,fordoingnothingseemedawasteoftime.His"relaxingbythefire"consistedofplayingchess,readingmagazines,orcheckingemails.Foranexperiment,Alanaskedhimto"waste"histimeforfiveminutesduringoneoftheirsessionstogether.Whattheengineerendedupdoingwasrelaxing,sittingquietlyanddaydreaming.Whenhewasfinallyabletoadmitthatemotionalreasonscausedhimtorejectrelaxingasawasteoftime,hebegantolookmorecriticallyatthatwayofthinking.Onceheknewthatrelaxingwasagooduseoftime,hebecamelessseriousaboutbeingbusyandstartedenjoyingeachactivitymore.Previouslyhehadbeensobusydoingthathehadnotimetohavefunatanything.Hebegantodolessandhavemorefun.WhenAlansawtheclientaboutthreeyearslater,hestillhadasbusyascheduleasever,buthewasabletobalancehisactivitywithrelaxingsothathecamebacktoworkMondaymorningnotfeelingtiredoutfromabusyweekendbutrefreshed.Whatcanbeinferredfromthepassageabout"doingnothing"A.ItmakespeopleenjoymoreindooractivitiesB.ItenablesyoutohavemoreworktimeC.ItservestoimprovefamilyrelationshipD.Ithelpsyoudothingsmoreefficiently

24、Animalshavedifferentwaysofprotectingthemselvesagainstwintertimeweather.Someanimalsgrowheavycoatsoffurorfeathers,whileothersdigintothegroundtofindawarmwintertimehome.Someanimalsspendthewinterinadeepsleepbecausebygoingtosleeptheyavoidthetimeoftheyearwhenfoodisscarceandthetemperaturesarelow.TheirsleepisknownasThereismuchabouthibernationthatpuzzlesscientists.Forexample,theyarewonderinghowhibernationcameintobeing.Somescientistshaveexploredthepossibilitythatanimalsreleaseachemicalthatstartsthemhibernating.Onethingthatscientistsarecertainaboutisthatanimalshibernateonlywhenitiscold.Hibernationisaseasonalpractice．Someanimalsthatfallintoawintertimesleeparenottruehibernatorsbecausetheyspendonlyapartofthecoldseasonasleep.Bears,forexample,caneasilybeawakenedfromtheirwinternap.Theyarenottruehibernators.Sometimesitisdifficulttodeterminewhetheraparticularanimalisatruehibernator.Forexample,somemicehibernate,butothersdonot.Thesameistrueofbats.Someofthemhibernate.Othersdonot.Hibernationisaseasonalpractice.Thismeansit____.（）A.takesplaceonlyduringaparticularseasonB.onlyafewanimaldothispracticeC.isamonthpracticeD.onlyhappenswhenaspeciesbecomesover-populated

25、Spaceisadangerousplace,notonlybecauseofmeteorsbutalsobecauseofraysfromthesunandotherstars.Theatmosphereagainactsasourprotectiveblanketonearth.Lightgetsthroughandthisisessentialforplantstomakethefoodwhichweeat.Heat,too,makesourenvironmentendurable.Variouskindsofrayscomethroughtheairfromouterspace,butenormousquantitiesofradiationfromthesunarescreenedoff.Assoonasmenleavetheatmospheretheyareexposedtothisradiation.Buttheirspacesuitsorthewallsoftheirspacecraft,iftheyareinside,dopreventalotofradiationdamage.Radiationisthegreatestknowndangertoexplorersinspace.Theunitofradiationiscalled“rem”.Scientistshavereasontothinkthatamancanputupwithfarmoreradiationthan0.1remwithoutbeingdamaged;thefigureof60remshasbeenagreedon.Thetroubleisthatitisextremelydifficulttobesureaboutradiationdamage－apersonmayfeelperfectlywell,butthecellsofhisorhersexorgansmaybedamaged,andthiswillnotbediscovereduntilthebirthofdeformed（畸形的）childrenorevengrandchildren.MissionsoftheApolloflightshavehadtocrossbeltsofhighradiationand,duringtheoutwardandreturnjourneys,theApollocrewaccumulatedlargeamountofrems.Sofar,nodangerousamountsofradiationhavebeenreported,buttheApollomissionshavebeenquiteshort.Wesimplydonotknowyethowmenaregoingtogetonwhentheyspendweeksandmonthsoutsidetheprotectionoftheatmosphere,workinginaspacelaboratory.Drugsmighthelptodecreasethedamagedonebyradiation,butnoreallyeffectiveoneshavebeenfoundsofar.Wecaninferfromthispassage____.（）A.exposuretoeventinyamountsofradiationisfatalB.theeffectofexposur