Itisonlyduringthelastfewyearsthatmanhasgenerallyrealizedthatintheworldofnatureabalanceexistsbetweenallformsoflife.Nolivingthingcanexistbyitself.Itispartofasysteminwhichallformsoflifearejoinedtogeth
Itisonlyduringthelastfewyearsthatmanhasgenerallyrealizedthatintheworldofnatureabalanceexistsbetweenallformsoflife.Nolivingthingcanexistbyitself.Itispartofasysteminwhichallformsoflifearejoinedtogether.Ifwechangeonepartofthenatureorder,thiswillalmostcertainlybringaboutchangesinsomeotherparts.
Thecuttingofforestsreducedthesupplyofoxygen.Thekillingofweedsandinsectsbychemicalsledtothewide-spreadpoisoningofanimalsandbirds.Thethrowingofwasteproductsintotheoceanhurtlifeinthesea,whilewastegaseschangedthechemicalbalanceoftheatmosphereandshutoutsomeofthesun’snecessarylife-givingrays.
Andsowecouldgoonaddingmoreexamplesuntilindespair(绝望)wemightfeellikegivingupthestruggletocontroltheseharmfulhumanactivities.Manisverycleveratchangingtheworldaroundhimtosatisfyhisimmediateneeds,butheisnotsocleveratlookingfarahead,oratthinkingaboutwhatthefutureresultsofhisactionmightbe.Manmaywelldestroyhimselfbecauseofhissillyaction.
小题1:Thefirstparagraphtellsusthat_____.A.alllivingthingsinnaturedependoneachotherB.everythinginnaturecan’texistwithoutthehelpofmanC.manhasknowntheimportanceofthebalanceofnatureforalongtimeD.nolivingthingcanlivenaturally小题2:Inthesecondparagraphtheexamplesgivenareusedtoprovethat_____.A.allformsoflifebelongtoasysteminwhichallthepartscanbechangedforoneanotherB.itisonlyduringthelastfewyearsthatmanhasgenerallyknownthebalanceofnatureC.therearesomelivingthingswhichcanexistbythemselveswithoutchangeD.wecan’tchangeoneformoflifewithoutdestroyingthebalanceofnature小题3:Thelastparagraphsuggeststhatinordertogethisimmediatebenefits(利益)_____.A.manisalwaysanxioustocontrolhisactivitieswithinlimitsB.manisalwaystooeagerinplanningfordistantfutureC.manoftenfailstothinkabouttheirfutureresultsofhisaction