Pollution is caused either by man’s release of completely new and often artificial (人造) substances into the environment, or by r

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问题 Pollution is caused either by man’s release of completely new and often artificial (人造) substances into the environment, or by releasing greatly increased amounts of a natural substance (物质), such as oil from oil tankers into the sea.

选项

答案有两种情况可以造成污染。一是人类向周围环境排放新的人造物质；二是排放大量的天然物质，如油轮在海上发生泄油事件。

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成人本科学位英语

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Pollution is caused either by man’s release of completely new and often artificial (人造) substances into the environment, or by r

成人本科学位英语

WhenTVnewsprogramsreportwarsordisasters,theeditorsrarelyusethemosthorrifyingpicturesofdeadorwoundedvictimsb

SpeakerA:It’sgoodtoseethesunagain.SpeakerB:______

In1991,anewbreedofenvironmentalactivistsgatheredinWashington,D.C.,tobringnationalattentiontopollutionproblem

Forafamilyoffour,itismoreconvenientaswellascheapertositcomfortablyathome,withunlimitedentertainmentavailabl

Withouttelephoneitwouldbeimpossibletocarryonthefunctionsof______everybusinessoperationinthewholecountry.

Hudsonsaidhecouldnotkillalivingthingexceptforthe______ofhunger.

Asalways,thedowntownareawasthebusiestwithpeople______intheatres,restaurantsanddepartmentstores.

Theycouldn’timaginehis______toparticipateinthefall-recessouting.

Theideaofafishbeingabletogenerateelectricitystrongenoughtolightlampbulbs—oreventorunasmallelectricmotor—is

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