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 E.

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

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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
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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