2019-2020年高三英语一轮复习题组层级快练40Unit5Meetingyourancestors新人教版选修

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1、2019-2020年高三英语一轮复习题组层级快练40Unit5Meetingyourancestors新人教版选修Ⅰ.阅读理解Findalargeenoughcontainertofittheegg.Fillthecontainerwithvinegar(醋).Don'tfillitallthewaytothebrimthough,becausethenputtingtheegginwillmakeitoverflow．Justaddaround10dropsofthedyetothevinegartomakeyourfi

2、nishedbouncyegganycoloryouwantto.Getaraw,unboiledegg.Placeitinthevinegar－filledcontainer.Justdropitinfromrightabovethevinegarandmakesureitispletelysubmerged(淹没)．Coverthecontainer.Thelesssunlightitgets,thebetter.Waitfortheshelloftheeggtopletelydissolve.Thisprocessc

3、antakeanywherefrom24to72hours.Tobeonthesafeside,waitthreedaysbeforecontinuing.Lookattheeggthroughthecontainereveryonceandawhiletocheckitsprogress.Theeggwillturnatransparentcolorbecausetheeggshellisincreasinginthickness.Theeggshellwillsoondissolve,leavingjustathick

4、strongeggwhite.Thereasonwhyshelldissolves(溶解)isthatvinegarisaweakacid.Theeggshellismadeofcalciumcarbonate(碳酸钙).Whentheshellmeetsvinegar,itmakesachemicalreactionthatturnsthecalciumcarbonateintocarbondioxide.Taketheeggoutofthevinegarcarefully.Justreachinandpullitout

5、withyourhand.Don'tforgettowashyourhandafterwards.Placetheeggonacoupleofpapertowelstoletitdry.Beextracarefulwhenhandlingarawbouncyegg.Itwillbemoreeasilybrokenthanaboiledbouncyegg.Bounceit.Startwithjustafewinches,andhavecleaningsuppliesready!1.Whatdoestheunderlinedw

6、ord“overflow”probablymeaninParagraph1?A.Flowoutofthecontainer.B.Tobefullofacontainer.C.Fallontothetableordesk.D.Breakintosmallpieces.2.Whatisthepurposetocoverthecontainer?A.Tokeepairoutofthecontainer.B.Tokeepitfrombeingseen.C.Tokeepthecontainercool.D.Tokeepawayfro

7、mthesunlight.3.Itinfersthatthecontainermustbe________．A.hardenough　　　　　　B.transparentenoughC.strongenoughD.bigenough4.Whatmakestheeggshelldissolve?A.Waterinthecontainer.B.Airinthecontainer.C.Thechemicalreaction.D.Thecarbondioxide.5.Thepassagemainlytellsus________．

8、A.howtoplaywithabouncyeggB.whyeggshelldissolvesatlastC.howtomakeanunboiledbouncyeggD.howtoprotectabouncyegg答案与解析【文章大意】　这是一篇说明文。为我们讲述了制作弹力鸡蛋的实验过程。醋中含有弱酸，