单选题
According to Pro. Salt, plants that take up large amounts of metal in their tissues can be used to ______.
A、
clean polluted soil and cure disease like cancer
B、
clean up harmful waste materials in soil and improve people's diet
C、
produce large number of micronutrients such as iron and zinc
D、
create food with important minerals or vitamins
【正确答案】
B
【答案解析】
[分析] 文章首段即讲到美国的一位科学家，即下文中的David Salt，认为这样的植物可以用来解决两方面的问题——净化土壤和促进人类健康。
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