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问题 单项选择题

供水减压阀（），性能稳定，调节方便；适用于高层建筑冷、热水供水管网系统中。

A.结构复杂，体积大

B.结构复杂，体积小

C.结构简单，体积大

D.结构简单，体积小

答案

参考答案：D

选择题

已知等腰三角形一腰上的高线等于腰长的一半，那么这个等腰三角形的一个底角等于（  ）

A．150或750

B．150

C．750

D．1500和300
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选择题

同义选择。

1. It's nearly about twenty minutes.

A. almost

B. near

C. just

D. really

2. Whenever you are free, please come to see me.

A. As long as

B. No matter when

C. When

D. No matter what

3. —Hi, have you found your lost book?

—Not yet. I have looked for it everywhere, but I still haven't found it.

A. here and there　

B. somewhere

C. over there　

D. at those places

4. I received a letter from my friend yesterday.

A. have got　

B. heard from　

C. heard a letter from

D. got from

5. Mum has a bad headache. We have to send for the doctor at once.

A. ask the doctor to come　

B. find the doctor by ourselves

C. send the doctor away　　

D. go to the doctor's

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