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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
Pollution is caused either by man’s release of completely new and often artificial (人造) substances into the environment, or by r
admin
2012-03-26
47
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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