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。

解析

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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

WhoarethepoorintheUnitedStates?Asof1970,nearlytwo-thirdsofthepoorpeoplewerewhite.Althoughnonwhitesmakeupo

Theability______amentalrecordofearlierexperiencesisreferredtoas"memory".

Friendsplayanimportantroleinourlives,andalthoughwemaytakefriendshipfor【C1】______,weoftendon’tclearlyknowhow

Thelocalpeoplewerejoyfullysurprisedtofindthepriceofvegetablenolonger______accordingtotheweather.

Withthepossibleexceptionofequalrights,perhapsthemost【C1】______issueacrosstheUnitedStatestodayisthedeathpenalt

Amanhastomake______forhisoldagebyputtingasideenoughmoneytoliveonwhenold.

Teachersneedtobeawareoftheemotional,intellectual,andphysicalchangesthatyoungadultsexperience.Andtheyalsoneed

Geologistshavebeenstudyingvolcanoesforalongtime.Thoughtheyhavelearnedagreatdeal,theystillhavenotdiscoveredt

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