高中英语《Unit 2 Heroes》Section Ⅱ SectionⅢ课下作业 北师大版必修1.doc

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1、SectionⅡ&SectionⅢⅠ.完形填空Foryearsscientistshavebeenworriedabouttheeffectsofairpollutionontheearth'snaturalconditions.Somebelievethe__1__insidemanyhousesmaybemoredangerousthantheairoutside.Itmaybeonehundredtimes__2__.Indoorairpollutioncan__3__apersontofeeltired，tosuffereyepain，h

2、eadacheandother__4__.Somepollutantscancausebreathingdisorders，diseasesofbloodand__5__cancer.Mostscientistsagreethateverymodernhousehassomekindof__6__pollution.Peoplepaymore__7__totheproblemnow.Itisthatwhenbuildersbeganmaking__8__andofficestheydidnotwanttowasteenergy.Todothist

3、heybuiltbuildingsthatlimitedtheflowofairbetweeninsideandoutside.Theyalsobegan__9__manmadebuildingmaterials.These__10__arenowknowntoletoutharmfulgases.__11__theproblembecamemoreserious，scientistsbegansearchingfora__12__todealwithit.Theydiscoveredanaturalpollutioncontrolsystem_

4、_13__buildinggreenplants.Scientistsdon'treallyknow__14__controlairpollution.Theybelievethataplant'sleavesabsorbor__15__pollutants.In__16__theplantletoutoxygenthroughitsleavesandtinyorganizationonitsroots.Scientists__17__thatallbuildingsshouldhaveonelargeplantorseveralsmallpla

5、ntsinsideeveryninesquaremetersofspace.__18__ofdifferentplantsshowthateachabsorbsdifferentchemicals.Sothemosteffectivewayto__19__theairistousedifferentkindsofplants.Havinggreenplantsinsideyourhousecanmakeitaprettierandmore__20__place.1．A.air　　　　　　　　　B．lightC．healthD．atmosphere

6、2．A.lighterB．worseC．thickerD．heavier3．A.permitB．desireC．causeD．persuade4．A.pollutionB．gasesC．difficultiesD．problems5．A.atleastB．hardlyC．onlyD．even-6-6．A.actualB．looseC．indoorD．downtown7．A.fearB．attentionC．remarkD．store8．A.housesB．preparationsC．furnitureD．efforts9．A.usingB．res

7、istingC．valuingD．judging10．A.materialsB．tablesC．industriesD．drinks11．A.IfB．AlthoughC．AsD．Unless12．A.chanceB．instructionC．scientistD．way13．A.fromB．forC．withD．like14．A.waterB．plantsC．productsD．measures15．A.takeinB．putoffC．letoutD．giveout16．A.timeB．exchangeC．orderD．particular17．

8、A.suggestB．requireC．begD．order18．A.ColorsB．StudiesC．RootsD．Container