题目内容
（请给出正确答案）
[主观题]
To add selenium by taking pills are probably not effective because ______.A．the human body
To add selenium by taking pills are probably not effective because ______.
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
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