2014-2015学年人教版高中英语选修7单元测试题解析6份单元测评3

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1、单元测评(三)　Unit3　Underthesea(时间：90分钟　满分：110分)第一部分　阅读理解(共两节；满分30分)第一节　(共10小题；每小题2分，满分20分)阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。AIfyoutraveltoanewexhibitattheSanFranciscoGreenhouseofFlowers,youwillhaveachancetoseesomemeateatingplants.Takebladderworts,akindofsuchplant,forexample.The

2、yappearsosmallandgrowinaquietpool.Butthesearethefastestknownkillersoftheplantkingdom,abletocatchasmallinsectin1/50ofasecondusingatrap(陷阱)door!Oncethetrapdoorclosesontheanimalfallingintoit,theenzymes(酶)similartothoseinthehumanstomachslowlydigesttheinsect.Whendinnerisover,the

3、plantopensthetrapdoorandisreadyfortrapagain.Meateatingplantsgrowmostlyinwetareaswithsoilthatdoesn'toffermuchfoodvalue.Insuchconditions,theseamazingplantshavedevelopedinsecttrapstogettheirnutritional(营养)needsoverthousandsofyears.NorthAmericahasmoresuchplantsthananyotherconti

4、nent.Generallyspeaking,thetrapsmayhaveattractiveappearancetofooltheeye,likepitcherplants,whichgettheirnamebecausetheylooklikebeautifulpitchers(acontainerlikeabottle)fullofhoney.TheAsianpitcherplant,forexample,hasbrightcolorsandanattractivehalfclosedcover.Curiousinsectsareat

5、tractedtocomecloseandtakeadrink,thenfalldowntheslipperywalltotheirdeaths.Someofthesepitchersarelargeenoughtoholdtwogallons(7.5liters).Meateatingplantsonlyeatpeopleinsciencemovies,butsometimesabirdorothersmallanimalswilldiscoverthatapitcherplantisn'tagoodplacetogetadrink.语篇解

6、读　本文是说明文。大自然千奇百怪，人们对食肉的动物并不陌生，但你见过食肉的植物吗？本文将为你介绍一二。1．FromParagraph1,wecanknowthatmeateatingplantscan________.A.catch50smallinsectsinasecondB.catchaninsectintheshortesttimeC.befoundfloatingonaquietlakeD.noticeaninsectin1/50ofasecond答案与解析　B　细节理解题。第一段最后一句以bladderworts为例，它能在1/5

7、0秒内将昆虫捉住，说明这种植物捕捉昆虫的速度很快，B项符合文意。2．Whatdoesitmeanifthetrapdoorofameateatingplantisclosed?A.Theplantisfoolinginsectsintotakingadrink.B.Theplantisproducinghoney.C.Theplantisattractinginsectstocomeclose.D.Theplantisenjoyingadinner.答案与解析　D　推理判断题。第二段中讲到昆虫落网后，酶开始消化食物，吃完后叶子张开准备再次捕捉

8、昆虫，因此可推知，叶子关闭说明植物正在享受大餐。3．Meateatingplantscangrowinwetandpoorsoilbecausethey______