大学英语四级阅读理解试题（三）附答案

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1、大学英语四级阅读理解试题40篇之二十一（含答案）21/200Flyingoveradesertareainanairplane,twoscientistslookeddownwithtrainedeyesattreesandbushes.Afteranhour'sflightoneofthescientistswroteinhisbook,'Lookhereforprobablemetal'Scientistsinanotherairplane,flyingoveramountainregion,sentame

2、ssagetootherscientistsontheground,'Goldpossible.'Walkingacrosshillyground,fourscientistsreported,'Thisgroundshouldbesearchedformetals.'Fromanairplaneoverahillywastelandascientistsentbackbyradiooneword,'Uranium'.NoneofthescientistshadX-rayeyes:theyhadnomagicp

3、owersforlookingdownbelowtheearth'ssurface.Theyweremerelyputtingtouseoneofthenewestmethodsoflocationmineralsintheground---usingtreesandplantsassignsthatcertainmineralsmayliebeneaththegroundonwhichthetreesandplantsaregrowing.Thisnewestmethodofsearchingforminer

4、alsisbasedonthefactthatmineralsdeepintheearthmayaffectthekindofbushesandtreesthatgrowonthesurface.AtWatsonBarCreek,abrooksixthousandfeethighinthemountainsofBritishColumbia,Canada,amineralsearchgroupgatheredbagsoftreeseeds.Boxedwerefilledwithsmallbanchesfromt

5、etrees.Rootsweredugandputintoboxes.Eachbagandboxwascarefullymarked.Inascientificlaboratorythepartsoftheforesttreeswereburnedtoashesandtested.Eachsmallpartwasexaminedtolearnwhetherthereweremineralsinit.Studyoftheroots,branches,andseedsshowednosilver.Buttherew

6、eresmallamountsofgoldintherootsandalittlelessgoldinthebranchesandseeds.Theseedsgrowingnearesttothetreetrunkhadmoregoldthanthosegrowingontheendsofthebranches.Ifthetreeshadnotindicatedthattherewasgoldintheground,thescientistswouldnothavespentmoneytopayfordiggi

7、ngintothedeeper.Theydiddigandfoundmorefoldbelow.Theydugdeeper.Theyfoundlargequantitiesofgold.1.Scientistswereflyingoveradesertorhillywastelandoramountainregioninordertosearchfor_____intheground.a.goldb.silverc.metalsd.minerals2.Thestudyoftrees,branchesandroo

8、tsindicatesthat_______.a.therewerelargeramountsofgoldinthebranchesthanintheseeds.b.thereweresmallamountsofgoldintherootsthaninthebranchesc.therewerelargeramountsofgoldintheseedsgrowingnearesttot