单选题：Industrially contaminated sites usually require athorough c

题目分类：理工类
题目类型：单选题
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题目内容：

Industrially contaminated sites usually require athorough clean-up due to__________. 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

参考答案：

答案解析：

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