单项选择题

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
<上一题 目录 下一题>
热门 试题

单项选择题
Mr. Salt wants to create anti-cancer foods by ______.
A．copying tissues from wild plants that take up selenium naturally into crop plants
B．copying genes that causes the plants to take up selenium from the soil
C．moving selenium from the tissues of wild plants into crop plants
D．moving genes from wild plants that take up selenium naturally into crop plants
单项选择题
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
相关试题