问题 多选题

夏天,如果自行车内胎充气过足,又在阳光下曝晒(曝晒过程中内胎容积几乎不变),车胎容易爆炸.关于这一现象,以下说法正确的是(  )

A.车胎爆炸,是车胎内气体温度升高,气体分子间斥力急剧增大的结果

B.在爆炸前的过程中,气体温度升高,分子无规则热运动加剧,气体压强增大

C.在爆炸前的过程中,气体吸热,内能增加

D.在车胎爆炸过程中,气体内能不变

答案

A、车胎内气体温度升高,发生等容变化,由查理定律可知,压强增大,而容易爆炸,不是由于气体分子间斥力急剧增大造成的.故A错误.

    B、气体温度升高,分子无规则热运动加剧.气体发生等容变化,由查理定律可知,温度升高,压强增大.故B正确.

    C、在爆炸前的过程中,气体体积不变,不做功,温度升高,内能增大,根据热力学第一定律分析得知,气体一定吸热.故C正确.

    D、在车胎爆炸过程中,气体对外做功,而吸放热很少,由根据热力学第一定律分析得知,气体内能减小.故D错误.

故选BC

阅读理解

Henry Smith taught science at the City School. One day, he wen to a bookstore and bought some books. Most of them were expensive. He left them in his car in a quiet street. Then he went and bought some other things at other shops. At 6 o’clock he came back to the car. One window was open and the books were gone. Henry drove back to his home in Lake Street.

That night he wrote a letter to a newspaper. The next day he went to the police station.

On Friday people read an advertisement in the newspaper.

BOOKS WANTED

DO YOU HAVE ANY BOOKS THAT YOU NO LONGER WANTED? I BUY OLD AND MODERN BOOKS. OPEN ALL DAY ON SATURDAY. HENRY SMITH, 18 LAKE STREET.

Henry stayed at home on Saturday. His first visitor came at 8 o’clock.

Henry took him to the kitchen. At half past nine another man arrived. He had a bag under his arm.

“Mr Smith?” the man asked.

“That’s right,” Henry said, “Can I help you?”

“I have some good books. You buy books, don’t you?”

“Yes, bring them in. I’ll have a look at them.”

Soon the books were on the dining-table.

“Come in now,” Henry called out, “And bring the list.”

A policeman came into the dining-room. He read the titles(书名) on the books and those on the list in his hand. They were the same.

“Come with me, Sir,” the policeman said to the man.

小题1:How did the man get the books? _____________

A.He bought them from Henry.

B.He bought them at a bookstore.

C.He found them lying in a quiet street.

D.He stole them from the car.小题2:Henry got his books back ___________.

A.by fooling the man into bringing the books to his house

B.by buying them from the first visitor

C.with the help of the bookstore

D.with the help of the City School小题3:The man who stole the books found Henry’s address ___________

A.in the car

B.in the newspaper

C.at the book store

D.at the police station小题4:What happened to the man?

A.He ran away.

B.He was very happy to sell the books.

C.He was caught by the policeman.

D.He was very clever.小题5:What is the best title for this reading?

A.A Book Advertisement

B.Mr Henry Smith

C.How Mr Smith Lost His Books

D.A clever man

判断题