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自考《英语(二)》真题练习:完成句子(1)

来源:彩票361登陆官网 发布时间:2018-03-05 15:10:11 点击量: 分享:
  【摘要】2018年4月自学考试复习资料尽在彩票361登陆官网,以下是自考《英语(二)》真题练习:完成句子(1),更多资讯请关注彩票361登陆官网自学考试频道。

  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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