BenandhisclassmatesarewatchingaDVDabouttheenvironment.Thisistheintroductiontothevideo,wherethenarratorexplainswhattheDVDisabout.Alongtimeago,mosttownsandvillageswereverysmall.Thenumberofpeoplewhol
<p>问题：BenandhisclassmatesarewatchingaDVDabouttheenvironment.Thisistheintroductiontothevideo,wherethenarratorexplainswhattheDVDisabout.Alongtimeago,mosttownsandvillageswereverysmall.Thenumberofpeoplewhol<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">陆徐福的回答：<div class="content-b">网友采纳 【分析】1.由文中“Peopledidnotusechemicals.Therewerenomotorvehicles.Therewerenofactories.Therewas,therefore,verylittlepollution”，可知过去污染环境的因素很少。 2.由文中“Therewasnoheavyindustry,onlyagricultureandartsandcraftsandnoneofthesethingsdamagedourenvironment”可知答案。 3.文中第四段中有“Theairisfullofpollutantsofallkinds—smokefromcarsandfactoriesandsuchthingsasinsectsprays”，空气中掺杂很多的污染物。 4.文中“Thismeansthatwearegraduallydestroyingoneofourmajorfoodsources—theoceansoftheworld”，因为海洋是我们食物的主要来源。 5.文中最后一段“IntheDVDwewilltrytofindwaystomakeourenvironmentcleanerandwaystostopfuturepollution”，显然findwaystomaketheenvironmentcleanerandstopfuturepollution项正确。 6.总结上下文可以看出先是对过去的描述，然后与现在对比，就是为了证明现在的污染加重了很多。
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