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问题 单项选择题

假定生产中所投入的各种生产要素除一种为可变要素外，其他要素的投入固定不变，则某企业生产A产品的总产量为100t，其中可变要素的投入量为20t，那么A产品的平均产量为（）。

A.10t

B.5t

C.1t

D.20t

答案

参考答案：B

填空题

We had so many things that we couldn’t move them by ourselves.
We had too many things ______ move them by ourselves.
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选择题

---What do you think of your parents?

---They always let me do ________ I think I should do.

A．when

B．that

C．how

D．what
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