Doctors warn people that one may develop

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问题选择题

Doctors warn people that one may develop skin cancer with his skin ________ to the sun too much.

A．exposes

B．exposing

C．exposed

D．being exposed

答案

答案：C

填空题

用所给动词的适当形式填空。

1. My father enjoys _____ (read) newspapers before breakfast.

2. Listen! Can you hear someone _____ (sing) in the next room?

3. I often help my mother _____ (clean) the house.

4.It’s easy to stay _____ (health)

5.He started _____ (learn)to ride a bike 5years ago.

填空题

计量经济模型的计量经济检验通常包括随机误差项的异方差检验、（）检验、解释变量的（）检验。