2017年卫生职称英语考试每日一练：补全短文（1月14日）
2017-01-14 16:47 来源：医学教育网
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补全短文
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
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