高中英语 unit 3 under the sea单元综合测试 新人教版选修71

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1、Unit3Underthesea答题栏12345678910111213141516171819202122232425262728293031323334353637383940Ⅰ.阅读理解AAbout97%oftheworld'swaterissaltyandisfoundinouroceansandseas.But,aswecan'tdrinkseawater,howcanitbeimportant?Everypartofourseasandoceanscontainsanamazingnumberofanimalsan

2、dfishthatliveatdifferentoceandepths.Mostofthedifferentspeciesofanimalsandfishdependonsimpleplantsfortheirfood.Thesesimpleplantscalledalgae(海藻)driftnearthesurfaceoftheoceanandusesunlighttoturncarbondioxideandwaterintofoodandoxygen.Infact,algaeproduceoverhalfoftheoxyg

3、enpeoplebreathe.Howimportantseawateris!Eachplantoranimalinourseasandoceansisanimportantlinkinafoodchain.Thealgaeareeateninlargeamountsbymicroscopicanimals,whichareinturnconsumedbylargeranimals.Thesefoodchainsaredelicatelybalanced.Thebadnewsaboutthefoodchainsintheoce

4、ansisthattheyareunderthreatbecauseofman.Peopleoncethoughtthattheoceansweresobigthatitdidn'tmatterifwedumpedrubbishintothemorcaughthugequantitiesoffishandwhalesforfood.Butwenowknowthisisnottrue,andfishstocksintheoceanshavestartedtodrop.Thankfully,theworldistakingstep

5、stoprotectthefutureofouroceansbyintroducinginternationalagreementstoprotectmarinehabitats.Mostcountrieshaveintroducedfishingrestrictionstoprotectfishstocksintheoceans,andnewtechniquesarebeingpioneeredtocopewithpollution.Finally,theimportanceofprotectingoceansisbeing

6、madeknowntomorepeople.Thisisjustthebeginningofalongprocesstoprotecttheoceansforourfuture.Wedependontheoceansforfishwhichareanimportantpartofthehumandiet.Howimportantseawateris!1．Whichofthefollowingistheproperorderofthefoodchain?A．smallanimals→algae→microscopicanimal

7、s→largeanimals→manB．algae→microscopicanimals→largeanimals→largeranimals→manC．smallanimals→algae→largeanimals→microscopicanimals→manD．microscopicanimals→algae→largeanimals→largeranimals→man-13-2．Fromthepassage,welearnthat________.A．mostfishandseaanimalsliveatthesurfa

8、ceoftheseasB．itisverydifficulttobreakthebalanceofafoodchainC．excessivefishinghascausedthedecreaseinfishstockD．itwon'tbelongbeforetheproble