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问题 单项选择题

汽车行驶时驱动桥出现连续的“嗷嗷”声，车速过快，声响也加大，滑行稍有减弱，表明圆锥主从动轮齿轮（）。

A.啮合间障过大

B.啮合间隙过小

C.轮齿有折断

D.润滑不良

答案

参考答案：B

填空题

词汇运用。

1. There are four s _____ in a year.

2. It's _____ (重要的) for you to drink a lot of water every day. There are no calories in water.

3. Health is wealth. Everyone in the world wants to be _____ (health).

4. We have breakfast because we need lots of _____ (能量) to study and work.

5. He leaves home without _____ (say) anything to his parents.

6. Her house is next to mine. She's my n _____ .

7. The sun shines t _____ the window in the room.

8. Kitty and Amy want to be _____ (dance) when they grow up.

9. If you want to keep healthy, you must _____ (改变) your diet.

10. Millie swims _____ (two) a week.
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不定项选择

下列有关中共第一次工作重心转移的叙述，正确的是（）

A．在革命面临危机的背景下被迫转移的

B．经历了一个先实践后理论的认识过程

C．使党的民主革命任务发生了根本变化

D．找到了一条适合中国国情的正确革命道路
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