PassageThreeQuestions31to35arebasedonthefollowingpassage.
Anunderstandingofman'seffectonthebalanceofnatureiscrucial(关键的)tobeingabletofindtheappropriateremedialaction.Itisaverycommonbeliefthattheproblemsofthepopulationexplosionarecausedmainlybypoorpeoplelivinginpoorcountr ieswhodonotknowenoughtolimittheirreproduction.Thisisnottr ue.Theactualnumberofpeopleinanareaisnotasimportantastheeffecttheyhaveonnature.Developingcountr iesdohaveaneffectontheirenvironment,butitisthepopulationsofrichercountr iesthathaveafargreaterimpactontheearthasawhole.
Forexample,tr opicalforestsareknowntobeessentialtothebalanceofnature,yetwearedestr oyingthematagreatr ate.Theyarebeingclearednottobenefitthenativesofthatcountr y,buttosatisfytheneedsofrichcountr ies.Centr alAmericanforestsarebeingdestr oyedforgrasslandtomakepetfoodintheUnitedStatescheaper;inPapuaslewGuinea,forestsaredestr oyedtosupplycheapercardboardpackagingforJapaneseelectr onicproducts;inBurmaandThailand,forestshavebeendestr oyedtoproducemoreattr activefurnitureinSingaporeandHongKong.Therefore,arichpersonlivingthousandsofmilesawaymaycausemoretr opicalforestd estr uctionthanapoorpersonlivingintheforestitself.
Inshort,itiseverybody'sdutytosafeguardthefutureofmankind—notonlythroughpopulationcontr ol,butbybeingmoreawareoftheeffecthisactionshaveonnature.Natureisbothfragileandpowerful.Itisveryeasilydestr oyed;ontheotherhand,itcaneasilydestr oyitsmostd angerousenemy—man.
31.Accordingtothefirstparagraph,peopleusuallybelievethat.
A.poorpeopleinpoorcountr iescontr ibutetotheimbalanceofnature
B.richpeopleknowhowtoprotecttheenvironmentbytakingactions
C.peopleinpoorareasknowalotaboutthebirthcontr ol
D.richpeopleinrichcountr ieshavedonealottobalancenature
正确答案：A
