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1、阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。AGreeninvadersaretakingoverAmerica.Notinvadersfromspace,butplants!Youmightnotthinkofplantsasdangerous,butinthiscasetheyarethreateningnature’sdelicatefoodchain.Theinvadersareplantsbroughtherefromothercountriest
2、omakegardensandyardslookpretty.EversincepeoplestartedtoarriveonAmerica’sshores,theyhavecarriedalongtrees,flowers,andvegetablesfromotherplaces.Nowtherearesomanyofthoseplants,theyarecrowdingoutthenativeplantsthathavelivedheresincebeforehumansettlersarri
3、ved.Andthat’saproblem,saysDr.DougTallamy.He’sinsectexpertattheUniversityofDelaware.Heexplainsthatalmostalltheplant-eatinginsectsintheUnitedStatesarespecialized,whichmeanstheyeatonlycertainplants.Monarchbutterflycaterpillars(幼虫),forexample,dineonmilkwe
4、ed.Ifpeoplecutdownmilkweedandreplaceitwithanotherplant,thebutterflieswillnothavethefoodsourcethattheyneedtosurvive.Butthetroubledoesn’tstopthere.Wheninsectscan’tgettherightplantstoeatandtheydieoff,thenthebirdsdon’thaveenoughbugsfortheirmeals.Tallamypo
5、intsoutthatalmostallmigratingbirdsdependoninsetstofeedtheiryoung.“Wecannotlettheplantsandanimalsaroundusdisappear.”saysTallamy,“Thewaytopreservethemistogivethemfoodtoeat.Butwhenweplantnon-nativeplants,weareclobberingthefoodchain,becausethenwedon’thave
6、theinsectsthebirdsneedtolive.”Feweroftherightplantsmeanfewerbugs,andfewerbugsmeanfewerbirds.Andthat’sbadfortheEarth,becauseweneedavarietyoflivingthingstokeeptheplanethealthyandbeautiful.Thegoodnewsis,gardencenterssellnativeplants.“JustGoogle‘nativepla
7、nts’andyourlocation,andyoucanfindoutwhichplantsreallybelongwhereyoulive,”saysTallamy26.HowdidgreeninvadesarriveatAmerica?A.Theyfelldownfromspace.B.TheyfloatedtotheAmerica’sshores.C.TheywerebroughtinfromforeigncountriesD.Theyhaslivedheresincehumansettl
8、ersarrived【答案】C【解析】细节理解题。根据Theinvadersareplantsbroughtherefromothercountriestomakegardensandyardslookpretty.它们是从国外引进的植物，故选C。27.AccordingtoDr.Tallamy,whichofthefollowingsabouttheinsectsintheUSisNOTtrue?A.Almostalltheplant-eatinginsectsinaplacee
