2016职称英语考试复习理工类阅读判断试题.doc

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1、2016职称英语考试复习理工类阅读判断试题　　Onlyspecialplantscansurvivetheterribleclimateofadesert，fortheseareregionswheretheannualrangeofthesoiltemperaturecanbeover75℃.Furthermore，duringthesummertherearefewcloudsintheskytoprotectplantsfromthesun'sray.Anotherproblemisthefactthattherearefrequentlystrongwindswhich

2、drivesmall，sharpparticlesofsandintotheplants，tearinganddamagingthem.Themostdifficultproblemforallformsofplantlife，however，isthefactthattheentireannualrainfalloccursduringafewdaysorweeksinspring.　　Grassesandflowersindesertsurvivefromoneyeartothenextbyexistingthroughthelong，hot，dryseasoninthef

3、ormofseeds.Theseseedsremaininactiveunlesstherightamountofrainfalls.Ifnorainfalls，orifinsufficientrainfalls，theywaituntilthenextyear，orevenstillthenext.Anotherfactorthathelpstheseplantstosurviveisthefactthattheirlifecyclesareshort.Bythetimethatthewaterfromthespringrainsdisappears——justafewwee

4、ksafteritfalls——suchplantsnolongerneedany.　　Theperennialshavespecialfeatureswhichenablethemtosurviveasplantsforseveralyears.Thus，nearlyalldesertperennialshaveextensiverootsystemsbelowgroundandasmallshootsystemaboveground.Thelargerootnetworkenablestheplanttoabsorbasmuchwateraspossibleinashort

5、time.Thesmallshootsystem，ontheotherhand，considerablylimitswaterlossbyevaporation.　　Anotherfeatureofmanydesertperennialsisthataftertherainyseasontheylosetheirleavesinpreparationforthelong，dryseason，justastreesinwetterclimateslosetheirsinpreparationforthewinter.Thisreducestheirwaterlossbyevapo

6、rationduringthedryseason.Then，innextrainyseason，theycomefullyaliveoncemore，andgrownewbranches，leavesandflowers，justasthegrassesandflowersindesertdo.　　16.Ordinaryplantsareunabletosurviveinthedesertmainlybecauseofthechangeableweather.　　A.Right　　B.Wrong　　C.Notmentioned　　17.Grassesandflowersinde

7、sertareabletosurvivebecausetheystayintheformofseedstowaitfortherightamountofwatertocome.　　A.Right　　B.Wrong　　C.Notmentioned　　18.Grassesandflowersinthedesertwhoselifecyclesareshortshowstheirabilitytoadapttothequickdisappearanceofrainwaterthereafterit