试讲高考阅读题教学教材.doc

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1、精品好文档，推荐学习交流Abuild-it-yourselfsolarstill（蒸馏器）isoneofthebestwaystoobtaindrinkingwaterinareaswheretheliquidisnotreadilyavailable.DevelopedbytwodoctorsintheUSDepartmentofAgriculture,it’sandexcellentwatercollector.Unfortunately,youmustcarrythenecessaryequipmentwithyou,si

2、nceit’sallbutimpossibletofindnaturalsubstitutes.Theonlycomponentsrequired,though,are5’sheetofclearorslightlymilkyplastic,sixfeetofplastictube,andacontainer—perhapsjustadrinkingcup—tocatchthewater.Thesepiecescanbefoldedintoaneatlittlepackandfastenedonyourbelt. Toconst

3、ructaworkingstill,useasharpstickorrocktodigaholefourfeetacrossandthreefeetdeep.Trytomaketheholeinadampareatoincreasethewatercatcher’sproductivity.Placeyourcupinthedeepestpartofthehole.Thenlaythetubeinplacesothatoneendrestsallthewayinthecupandtherestofthelinerunsup—an

4、dout—thesideofthehole.Thenlaythetubeinplacesothatoneendrestsallthewayinthecupandtherestofthelinerunsup—andout—thesideofthehole.Next,covertheholewiththeplasticsheet,securingtheedgesoftheplasticwithdirtandweightingthesheet’scenterdownwitharock.Theplasticshouldnowformac

5、one(圆锥体）with45-degree-angledsides.Thelowpointofthesheetmustbecentereddirectlyover，andnomorethanthreeinchesabove,thecup.Thesolarstillworksbycreatingagreenhouseundertheplastic.Groundwaterevaporates(蒸发）andcollectsonthesheetuntilsmalldropsofwaterform,rundownthematerialan

6、dfalloffintothecup.whenthecontainerisfull,youcansuchtherefreshmentoutthroughthetube,andwon’thavetobreakdownthestilleverytimeyouneedadrink.32.Whatdoweknowaboutthesolarstillequipmentfromthefirstparagraph?A.ItisdelicateB.It’sexpensiveC.It’scomplexD.It'sportable33Whatdoe

7、stheunderlinedphrase”thewatercatcher”inparagraphA.ThetubeB.ThestillC.TheholeD.Thecup仅供学习与交流，如有侵权请联系网站删除谢谢4精品好文档，推荐学习交流34What’sthelaststepofconstructingaworkingsolarstill?A.DigaholeofacertainsizeB.PutthecupinplaceC.Weightthesheet’scenterdownD.Covertheholewiththeplasti

8、csheet35Whenasolarstillworks,dropsofwatercomeintothecupform?A.theplastictubeB.outsidetheholeC.theopenairD.beneaththesheet反思：先读题，再回到