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时间:2019-04-22
《2018届高考英语总复习真题研练52牛津译林版》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、真题研练52Task1:阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳选项。(2015·北京,C)LifeintheClearTransparentanimalsletlightpassthroughtheirbodiesthesamewaylightpassesthroughawindow.Theseanimalstypicallylivebetweenthesurfaceoftheoceanandadepthofabout3,300feet—asfarasmostlightcanreach.Mostofthemareextr
2、emelydelicateandcanbedamagedbyasimpletouch.SonkeJohnsen,ascientistinbiology,says,“Theseanimalslivethroughtheirlifealone.Theynevertouchanythingunlessthey'reeatingit,orunlesssomethingiseatingthem.”Andtheyareasclearasglass.Howdoesananimalbecomeseethrough?It'strickierthanyoumig
3、htthink.Theobjectsaroundyouarevisiblebecausetheyinteractwithlight.Lighttypicallytravelsinastraightline.Butsomematerialsslowandscatter(散射)light,bouncingitawayfromitsoriginalpath.Othersabsorblight,stoppingitdeadinitstracks.Bothscatteringandabsorptionmakeanobjectlookdifferentf
4、romotherobjectsaroundit,soyoucanseeiteasily.Butatransparentobjectdoesn'tabsorborscatterlight,atleastnotverymuch.Lightcanpassthroughitwithoutbendingorstopping.Thatmeansatransparentobjectdoesn'tlookverydifferentfromthesurroundingairorwater.Youdon'tseeit—youseethethingsbehindi
5、t.Tobecometransparent,ananimalneedstokeepitsbodyfromabsorbingorscatteringlight.Livingmaterialscanstoplightbecausetheycontainpigments(色素)thatabsorbspecificcolorsoflight.Butatransparentanimaldoesn'thavepigments,soitstissueswon'tabsorblight.AccordingtoJohnsen,avoidingabsorptio
6、nisactuallyeasy.Therealchallengeispreventinglightfromscattering.Animalsarebuiltofmanydifferentmaterials—skin,fat,andmore—andlightmovesthrougheachatadifferentspeed.Everytimelightmovesintoamaterialwithanewspeed,itbendsandscatters.Transparentanimalsusedifferenttrickstofightsca
7、ttering.Someanimalsaresimplyverysmallorextremelyflat.Withoutmuchtissuetoscatterlight,itiseasiertobeseethrough.Othersbuildalarge,clearmass4ofnonlivingjellylike(果冻状的)materialandspreadthemselvesoverit.Largertransparentanimalshavethebiggestchallenge,becausetheyhavetomakeallthed
8、ifferenttissuesintheirbodiesslowdownlightexactlyasmuchaswaterdoes.Theyneedtolookun
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