对输气量较大，压力变化不大的输气干线宜选用（）。A、螺杆压缩机 B、离心压缩机 C、

阅读短文，选择正确答案。

     A man was looking for things of the old times. One day he came to a village and found a blue bowl. It looked

very old. The bowl was on the ground and a cat was drinking milk from it. A farmer, the owner of the cat, was

sitting beside the bowl. The man did not want the farmer to know that he was interested in the bowl. So he said

to him in a soft voice, "What a nice cat you have! Will you sell it to me?"

    "How much will you give me for the cat?" the farmer asked.

    "Thirty dollars. Would that be enough?" Later, the farmer agreed. After he paid the farmer, the man said,

"This cat is used to eating with his bowl. May I take this bowl with the cat?" But the farmer said,"I'm sorry I

can't give you the bowl. Thanks to the bowl, I have sold thirty cats."

1. What does the sentence "A man was looking for things of the old times" mean? [ ]

A. He lost things in the past and wanted to get them back.

B. He liked talking to old people.

C. He liked keeping old things.

2. Why did the man want to buy the cat? [ ]

A. He liked it better than the bowl.

B. It was sold with the bowl.

C. He thought he could easily get the bowl after he bought the cat.

3. After he bought the cat, the man asked for the bowl, because he thought            .[ ]

A. the cat couldn't live without the bowl

B. the farmer didn't know the value of the bowl

C. the bowl should go with the cat

4. The farmer kept the bowl so that he could             . [ ]

A. let another cat use it

B. sell more cats

C. sell more bowls

5. From the story we can see that the farmer            . [ ]

A. had only one bowl

B. didn't like cats

C. was cleverer

在氏族公社中，人们的生活生产状况如何？

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原尿

对生产经营和生活健康产生严重威胁的风险，属于()。

A.必保风险

B.非必保风险

C.可保风险

D.意外伤害风险

挖掘机拉铲或反铲作业时，履带式挖掘机的履带距工作面边缘安全距离应大于1m，轮胎式挖掘机的轮胎距工作面边缘安全距离应大于（）。

A.0.5m

B.1m

C.1.5m

D.2m