AirPollution
Therewasonethoughtthatairpollutionaffectedonlytheareasimmediatelyaroundlargecitieswithfactoriesandheavyautomobiletr affic.____1____
Onseveraloccasionsoverthepastd ecade,aheavycloudofairpollutionhascoveredtheeastoftheUnitedStatesandbroughthealthwarningsinruralareasawayfromanymajorconcentr ationofmanufacturingandautomobiletr affic.Infact,theveryclimateoftheentireearthmaybeinfectedbyairpollution
Somescientistsconsiderthattheincreasingconcentr ationofcarbondioxide((二氧化碳)intheairresultingfromtheburningofcoalandoiliscreatinga"greenhouseeffect".Itconservesheatr eflectedfromtheearthandraisedtheworld’saveragetemperature.___2___ThusmuchofthepolaricecapwillmeltandcitiessuchasNewYork,Boston,Miami,andNewOrleanswillbeinwater.
___3___Thisisaresultthatwouldbeequallydisastr ous.Adropofjustafewdegreescouldcreatesomethingclosebetoanewiceage,andwouldmakeagriculturedifficultorimpossibleinmanyofourtopfarmingareas.
Todaywedonotknowforsurethateitheroftheseconditionswillhappen.___4___Drivenbyeconomicprofit,peopleneglectbythedamageonourenvironmentcausedbythe"advancedcivilization".___5___Butisitr eallyworthwhile?
APerhaps,ifweareluckyenough,thetwotendencieswilloffset(抵消)eachotherandtheworld'stemperaturewillstayaboutthesameasitisnow.
BIfthisviewiscorrect,theworld'stemperatureisraisedonlyafewdegrees.
Maybetheairpollutionisthepricethehumanbeingshavetopayfortheirdevelopment
DAtpresent,werealizethatalthoughthesearetheareaswiththeworstairpollution,theproblemisliterallyworldwide
ELately,globalwarmingisbecomingaseriousproblem
FAnotherview,lesswidelyheld,isthatincreasingparticularmatterintheatmosphere(大气)isblockingsunlightandloweringtheearth'stemperature.
答案及解析：最后,作者认为在经济利益的驱使下,人们忽略了“先进文明”造成的环境污染,最后一个空格处的内容应该与该信息一致。通过分析剩余选项C和E,不难发现C选项“也许空气污染是人类在发展过程中必须付出的代价”为此处应填句子。
