问题 选择题

在铺设铁轨时,两根铁轨的接头处一般要留有空隙,这是为了(  )

A.防止铁轨的热胀冷缩

B.减少铁轨的热胀冷缩

C.防止因铁轨受热膨胀受阻而产生的破坏作用

D.防止因铁轨冷却时受阻而产生的破坏作用

答案

车轮不停滚过摩擦产生热量,铁轨就会有一定的膨胀,留些间隙防止铁轨膨胀相互挤压变形引发事故;

故选C.

阅读理解

阅读短文,选择正确答案。

   When Mr. David retired(退休), he bought a small house in a village near the sea. He liked it and hoped to live

a quiet life in it. But to his surprise, many visitors came to see his house in summer holidays, for it was the most

interesting building in the village. From morning to night, there were visitors outside the house. They kept

looking into the rooms through the windows and many of them even went into the house. He decided to drive

the visitors away. So he put a notice on the window. The notice said, "If you want to satisfy your curiosity

(好奇心), come in and look around. Price: twenty dollars." Mr. David was sure that the visitors would stop

coming, but he was wrong. More and more visitors came and Mr. David had to spend every day showing them

around his house. "I came here to retire, not to work as a guide (导游)", he said angrily. In the end, he sold the

house and moved away.

1. Mr. David's house was              that many visitors came to see it. [ ]

A. so small

B. so quiet

C. so interesting

D. such interesting

2. Mr. David put a notice on the window in order              . [ ]

A. to drive the visitors away

B. to satisfy the visitors curiosity

C. to let visitors come in and look around

D. to get some money out of the visitors

3. The notice made the visitors             . [ ]

A. more interested in his house

B. lost interest in his house

C. angry at the unfair price

D. feel happy about the price

4. After Mr. David put up the notice              . [ ]

A. the visitors didn't come any more

B. fewer and fewer visitors came to see his house

C. more and more visitors came for a visit

D. no visitor would pay the money for a visit

5. At last he had to sell his house and move away because             . [ ]

A. he did not like it at all

B. he could not work as a guide

C. he made enough money and wanted to buy a new expensive house

D. he could not live a quiet life in it

单项选择题