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1、课时提升作业十四 必修3Unit4Astronomy:thescienceofthestars(限时35分钟)Ⅰ.阅读理解A(2021·衡阳模拟)BythetimeRobertPorterAllenwasbornin1905,thewhoopingcrane(鸣鹤)wasalreadyintrouble.ThebeautifulbirdwasoncecommonlyfoundacrossNorthAmerica.By1941,thewhoopingcranepopulationhaddwindledtothedo
2、ubledigits.ThetallestspeciesinNorthAmericawascriticallyendangered.Inthe1940s,theremainingcranesmigrated(迁徙)everyyearfromtheGulfCoastofTexastosomewhereinthenorthofCanadatobreed(繁殖).Theconservationcommunitydidn’tknowwherethebirdswent.Thewetlandswheretheyusedtos
3、pendwintersweregrowingrarerandrarerasthetiny,non-migratinggroupofwhoopingcraneswasaliveinLouisianain1941,butthegrouphaddisappearedbythetimeAllenstartedhisresearch.In1942,Allenundertookthewhoopingcraneprojectoverthenextthreeyears.Hedidalmostconstantfieldworkth
4、attookhimfromTexasupthecranes’migrationroutetoNebraska,andonintoSaskatchewaninsearchofthenestinggroundofthebirds.Studyingthebirdinitsbreedinghabitatandseeinghowmanybirdswerebornwouldallowconservationiststounderstandhowtohelpthebirdsontheirjourney.Butfindingth
5、ewhoopingcrane’snestingsitemeantdifficultandfruitlessairsearchesovernorthernCanada.In1952,Allenwroteareportonthewhoopingcrane.Thereportwasawarningcalltotheconservationcommunity:only33migratory“whoopers”remained,andtheirnestingsitestillhadn’tbeenfound.Twoyears
6、later,thewhoopingcranes’breedinggroundsinCanada’sWoodBuffaloNationalParkwerefinallyfound,andAllenheadednorthtostudythemfirst-hand—an“incrediblydifficultjourney”,inSprunt’swords.Allen’sworklaidthegroundworkforconservationiststosavethebirds.Theireffortspaidoffa
7、sthenumbersreached57by1970and214by2005.Today,thewhoopingcraneisstilllistedasendangered,butthereareroughly600birdsalive.1.Whatisthepassagemainlyabout?A.ItisastoryaboutAllen’ssearchingforalostbird.B.Itisastoryaboutthecranes’longmigrationflight.C.Itisastoryabout
8、thecranesurvivingthewinters.D.Itisastoryaboutconservingthewhoopingcrane.【解析】选D。主旨大意题。通读文章可知,整篇文章都是围绕保护濒危鸟类——鸣鹤的内容展开的,故答案为D项。2.Whatdoestheunderlinedword“dwindled”meaninthefirstparagraph?A.
