2. 外语
  3. A industrially polluted soils B rock and soil chemistry C naturally polluted soils D the pathways of metals into the food chain

A industrially polluted soils B rock and soil chemistry C naturally polluted soils D the pathways of metals into the food chain

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问题 A industrially polluted soils
B rock and soil chemistry
C naturally polluted soils
D the pathways of metals into the food chain
E the element of iodine
F the persistence of heavy metals
Industrially contaminated sites usually require a thorough clean-up due to______.
选项
答案F
解析 第四段涉及这一问题。受到工业污染的土壤含有重金属，而重金属很稳定，不容易降解，所以，要对重金属进行彻底的清除。
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