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自考《英语(二)》真题练习:完成句子题(8.24)

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来源:猎学网2017-08-29 11:15:37

单选题

[完成句子]Heavy metals are persistent; they do not break down to other chemicals in the environment. Industrially polluted sites usually undergo intensive clean-up and rehabilitation because heavy metals are a health concern once they enter the food chain. Some trace metals are alleged to cause cancer and are also known to cause poisoning.

Industrially contaminated sites usually require a thorough clean-up due to __________.

A、the persistence of heavy metals

B、industrially polluted soils

C、naturally polluted soils

D、rock and soil chemistry

正确答案:A

答案解析:本段提到:受到污染的土壤含有重金属,而且重金属很稳定,不容易降解,所以要对重金属进行彻底的清除。答案选择A。

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