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1、第十七单元检测(时间:100分钟 满分:120分)第一部分 阅读理解(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下面短文,从每题所给的A、B、C和D四个选项中,选出最佳选项。A(导学号53070027)(2021·北京高考)LifeintheClearTransparentanimalsletlightpassthroughtheirbodiesthesamewaylightpassesthroughawindow.Theseanimalstypicallylivebetweenthesurfaceoftheoceanandadepthofabout3,3
2、00feet—asfarasmostlightcanreach.Mostofthemareextremelydelicateandcanbedamagedbyasimpletouch.SonkeJohnsen,ascientistinbiology,says,“Theseanimalslivethroughtheirlifealone.Theynevertouchanythingunlessthey’reeatingit,orunlesssomethingiseatingthem.”Andtheyareasclearasglass.Howdoesananimalbecomesee-
3、through?It’strickierthanyoumightthink.Theobjectsaroundyouarevisiblebecausetheyinteractwithlight.Light精品Word可修改欢迎下载typicallytravelsinastraightline.Butsomematerialsslowandscatter(散射)light,bouncingitawayfromitsoriginalpath.Othersabsorblight,stoppingitdeadinitstracks.Bothscatteringandabsorptionmak
4、eanobjectlookdifferentfromotherobjectsaroundit,soyoucanseeiteasily.Butatransparentobjectdoesn’tabsorborscatterlight,atleastnotverymuch.Lightcanpassthroughitwithoutbendingorstopping.Thatmeansatransparentobjectdoesn’tlookverydifferentfromthesurroundingairorwater.Youdon’tseeit—youseethethingsbehi
5、ndit.Tobecometransparent,ananimalneedstokeepitsbodyfromabsorbingorscatteringlight.Livingmaterialscanstoplightbecausetheycontainpigments(色素)thatabsorbspecificcoloursoflight.Butatransparentanimaldoesn’thavepigments,soitstissueswon’tabsorblight.AccordingtoJohnsen,avoidingabsorptionisactuallyeasy.
6、Therealchallengeispreventinglightfromscattering.Animalsarebuiltofmanydifferentmaterials—skin,fat,andmore—andlightmovesthrougheachatadifferentspeed.Everytimelightmovesintoamaterialwithanewspeed,itbendsandscatters.Transparentanimalsusedifferenttrickstofightscattering.Someanimalsaresimplyverysmal
7、lorextremelyflat.Withoutmuchtissuetoscatterlight,itiseasiertobesee-through.Othersbuildalarge,clearmass精品Word可修改欢迎下载ofnon-livingjelly-like(果冻状的)materialandspreadthemselvesoverit.Largertransparentanimalshavethebiggestchallenge,becausethey
