2. 外语
  3. According to Pro. Salt, plants that take up large amounts of metal in their tissues can be used to ______. To add selenium by t

According to Pro. Salt, plants that take up large amounts of metal in their tissues can be used to ______. To add selenium by t

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问题 According to Pro. Salt, plants that take up large amounts of metal in their tissues can be used to ______.
To add selenium by taking pills are probably not effective because ______.
选项 A、the human body is not in the right chemical form
B、the human body does not accept it
C、the selenium is, not in the right chemical form to be absorbed
D、the selenium is difficult to absorb
答案C
解析 见文章的第八段。
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