- 欢迎访问江西自考网！本站为考生提供江西自考信息服务，网站信息供学习交流使用，非政府官方网站，官方信息以江西省教育考试院www.jxeea.cn为主。
山东自学考试-00015英语二每日一练12.19
1、【完成句子】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
【正确答案】 A
【答案解析】 本段提到：受到污染的土壤含有重金属，而且重金属很稳定，不容易降解，所以要对重金属进行彻底的清除。答案选择A。
