小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com选择性必修第三册Unit4AdversityandCourageⅠ.阅读理解AUntilnow，scientistshaven’tbeenabletostudythenewrockonthemoon.ThenewsamplesfromChang’e5willchangethis.They’refromnearMonsRümker，avolcanicmountainwheretherockisthoughttobemuchyounger—about1billionyearsold.Therearealotofreasonsscientistsareeagertostudythisyoungerrock，oneofwhichisthatitcouldhelpusmorepreciselydatenotonlythemoon，butmanyrockyplanetsandotherobjects.Here’showthatworks:Scientistsdatelunarrockbyusingsomethingcalledachronologycurve(年代学曲线)，saysJolliff，ascientistatWashingtonUniversityinSt.Louis.Basically，theyestimatetheageoftherockbycountingthenumberofcratersintheareatherockcomesfrom;thoseincreaseasobjectsstriketherockovertime.Tomakethisestimation，scientistsneedtomatchthenumberofcraterstoapreciseage.Rightnow，theyonlyhavedatapointsforlunarrockthatis3to4billionyearsold.Moderntechniquescandatethenewsampleextremelyaccurately，andoncescientistsknowitspreciseage，theycanaddavaluabledatapointtotheirchronologycurve.Thedatingsystemwillalsohelpusmoreaccuratelyestimatetheageofallsortsofobjectsinspace，likerockyplanetsandothermoons.Anotherreasonscientistsarekeentostudythisyoungvolcanicrockistofindoutmoreabouthowvolcanismworksonthemoon.Jolliffsaysthatit’sunclearwhytherewasvolcanicactivityonthemoonforsuchalongperiodoftime.Mostofthemoon’svolcanicactivity，hesays，isthoughttohaveoccurred3or4billionyearsago，whenthemoonwasstillprettyyoung.Butsincethemoondoesnothaveplatestructure，whichdrivesvolcanismonEarth，it’sunclearwhatcouldhavecausedmuchlatervolcanicactivity.“That’ssomethingthatyoucanfindoutofthesamplesbystudyingtheminthelab，”Jolliffsays.1．Whatdoestheunderlinedword“this”inparagraph1referto?A．Thefactofbeingunabletostudythenewrock.B．ThenewrockfromnearMonsRümker.C．Oneofthereasonstostudythemoon’snewrock.D．Thestudyofthemoon’syoungerrock.2．Scientistsresearchthisyoungerrockbecausetheycan.A．ensuretherewasvolcanicactivityonthemoonB．morepreciselydateonlythemoonC．datelunarrockbyusingachronologycurveD．explorehowvolcanismworksonthemoon小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com3．Whatcanweinferfromthelastparagraph?A．Scientistsarekeentostudythisyoungvolcanicrock.B．Scientistscan’tknowwhyvolcanicactivityexistsonthemoon.C．Themoon’svolcanicactivityoccurred3or4billionyearsago.D．It’sclearwhatcouldhavecausedmuchlatervolcanicactivity.4．Whatcanbeasuitabletitleforthetext?A．HowScientistsStudytheYoungerRockB．WhytheResearchIsImportantC．WhytheYoungerRockIsWorthStudyingD．WhatScientistsDotoStudytheYoungerRockBIn2016，inanIllinoistowncalledCahokia，awomanwassenttoprisonjustbecauseshefailedtotendherlawn(草坪)．In2019，aFloridamanwasfined$30,000bythecityofDunedinforallowinghisgrasstogrowmorethan10inchesinheight.Theseexamples，whileextreme，arenotrareoccurrenceinAmerica.Astudyestimatedthatturfgrasses(lawns，parks，athleticfields，etc.)coverover40millionacresinthecontinentalU．S.，anarealargerthananycroparea.AndAmericansspendasmuchas$60billionayearmaintainingthesegrasses.TheseimpressivedataaretheresultofAmericans’settingmuchstorebythesepiecesofgreeneryforseveralcenturies.Centuriesago，onlythosewithconsiderablewealthcouldowntheresourcesneede...