浙江省杭州市2019年中考英语一轮复习课时训练 03Units1_4七下课件
9页1、课时训练(三)Units1-4(七下)(限时:30分钟).2018连云港阅读理解Batsaretheonlymammalsthatcanflyagreatdistance,buttheyhaveanotherability.Manybatsliveaverylongtimeforananimaltheirsize.Europeanresearchersarestudyingbatstounderstandwhytheylivesolong.Theyhopetomakediscoveriestofighttheagingprocess(过程)inhumanbeings.Lastweek,thegroupofscientistssaidtheyhadfoundimportantbiologicalqualitiesinsomebatspecies.Thegroupstudiedbatchromosomes(染色体),alineofgenesfoundinthenucleus(核)ofcells.Thescientistsweremostinterestedinpartsconnectedt
2、otheendsofthechromosomes.Theyarecalledtelomeres(端粒).Telomeresprotecttheendsofchromosomes,whichshorteneachtimeacelldivides.Scientistsbelievethisshorteningprocesscausescellstobreakdown.AreportonbatswaspublishedthismonthinthejournalScienceAdvances.AmongtheleadersofthestudywasEmmaTeeling,abiologistwithUniversityCollegeDublininIreland.Teelingsaidstudyinglong-livingmammalsthathavedevelopedwaystofightaging “isanotherwaytoprovethemolecular(分子)basisofextended healthlength.” Sheaddedthatstudyingbatsmadesc
3、ientistsabletolearnmoreabouttheprocesses “thatdrivehealthyaging.”TheEuropeanresearchersstudied493batsfromfourbatspecies.Thegroupusedinformationthathadbeengatheredovermorethan60years.Oftheseanimals,thegreatermouse-earedbatgenerallylivedthelongest,anaverageof37years.Thescientistssaidthisandarelatedspecies,whicharegroupedtogetherunderthenameMyotis,hadtelomeresthatdidnotshortenwithage.AnotherMyotisbatholdstherecordforoldestage,reaching41years.Thescientistsfindingssuggestthatthesebatscellshavetheabil
4、itytokeepandrepairtheirtelomeres.This,theysaid,helpsguardagainsttheagingprocess.Basedonitsbodysize,abatlikethegreatermouse-earedbatwouldbeexpectedtolivefouryears.But,thesemammalshavebeenfoundtolivenearly10timeslongerthanthat.ThescientistsfoundthatEighteenofthesearebats.TheonlyexceptionisanunusualAfricanrodent,thenakedmolerat.1.WhichsentencecanbeputattheendofParagraph3?A.Thismakesscientistsabletostudybats.B.Thatswhybatscanflyagreatdistance.C.Theysaythisiswhatcausesaging.D.Theydiscoverthecellsconn
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