单项选择题

We request the honor of your presence, which will surely do credit to the Conference.

A．你能到场我们感到很荣耀，那一定是这次会议信誉度很高的原因。
B．我们诚盼您的出席，那一定会增加这次会议的信誉。
C．您的光临必将为本届会议增辉。
D．我们很荣幸地邀请您的出席，那一定会为这次会议增光彩。
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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
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
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