阅读理解
Itisonlyduringthelastfewyearsthatmanhasgenerallyrealizedthatintheworldofnatureabalanceexists(存在)betweenallformsoflife.Nolivingthingcanexistbyitself;itispartofasysteminwhichallformsoflifearejoinedtogether.Ifwechangeonepartofthenatureorderthiswillinturnalmostcertainlybringaboutchangesinsomeotherpart.
Thecuttingdownofforestsreducesthesupplyofoxygen.Thekillingofweedsandinsectsbychemicalsleadstothewidespreadpoisoning(中毒)ofanimalsandbirds.Thethrowingofwasteproductsintotheoceanhurtslifeintheseawhilewastegaseschangethechemicalbalanceofatmosphereandshutoutsomeofthesun'snecessarylifegivingrays.
Andsowecouldgoonaddingmoreexamplesuntilindespair(绝望)wemightfeellikegivingupthestruggletocontrolandkeepwithinlimitstheseharmfulhumanactivities.Manisverycleveratchangingtheworldaroundhimtosatisfyhisimmediateneedbutheisnotsocleveratlookingfaraheadoratthinkingaboutwhatthefutureresultsofhisactionmightbe.Manmaywelldestroyhimselfinhisattempttobetooambitious(野心).
1.Theexamplesgiveninthesecondparagraphareevidences(证据)that________.
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A.itisduringthelastfewyearsthatmanhasgenerallyknownthebalanceofnature
B.therearesomelivingthingswhichcanexistbythemselveswithoutchange
C.allformsoflifebelongtoasysteminwhichallthepartscanbechangedforanother
D.wecannotchangeoneformoflifewithoutdestroyingthebalanceofnature
2.Thelastparagraphsuggeststhatinman'sattempttoincreaseimmediatebenefits________.
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A.manoftenfailstothinkabouthisfutureresultsofhisaction
B.manisalwaystooambitioustoplanningdistantfuture
C.manoftenfeelsthathewillhavetogiveupindespair
D.manisalwaysanxioustocontrolandkeephisactivitieswithinlimits
3.WhichofthefollowingstatementsisTRUE?
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A.Cuttingdownwoodsdoeslittleharmtohumanbeings.
B.Manhastopaymuchattentiontothefutureresultsofhispresentaction.
C.Oxygencomesfromforests.
D.Thispassagetellsustotryourbest
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