醫(yī)學全在線每日一練免費為所有職稱英語考生免費提供練習題，祝廣大考生順利通過2016年職稱英語考試。
閱讀理解：
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.
The main idea of this paragraph is__________.
A.The Nature of Heavy Metals
B.Potential Hazards of Human Contaminated Soils
C.Heavy Metals and Food Chain
D.Research on Channels of Heavy Metals Getting into Human Food Chain
正確答案：B
答案解析：本段文字講的是：受到工業(yè)污染的土壤含有重金屬，而重金屬很穩(wěn)定不容易降解，其中的某些微量重金屬能使人致癌或中毒�？梢钥闯銎渲行膬热菔牵菏芪廴就恋氐臐撛谖ｋU，選擇B。
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