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问题 多项选择题

定基发展速度和环比发展速度的关系有（）

A.相邻两个环比发展速度之商等于相应的定基发展速度

B.相应环比发展速度的连乘积等于定基发展速度

C.相应定基发展速度的连乘积等于环比发展速度

D.相邻两个定基发展速度之商等于相应的环比发展速度

E.两者都属于速度指标

答案

参考答案：B, D, E

选择题

He was busy writing a story, only ______ once in a while to smoke a cigarette.

A．to stop

B．stopping

C．to have stopped

D．having stopped
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填空题

用所给词的适当形式填空。

1. The children were _____ (excite) about opening their presents.

2. It is a _____ (complete) story.

3. He will _____ (challenge) me to play another ten- nis game tomorrow.

4. Could you please speak more _____ (slow)? I can't follow you.

5. He is _____ (regard) as the best writer nowadays.

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