问题 单项选择题 共用题干题

如果未按常规程序进行塑料热处理操作,结果义齿基托会出现"花基板",且发生变形,密合度差。

热凝塑料经水浴处理,其后果是()

A.PMNA发生聚合

B.MNA发生聚合

C.平均分子量比牙托粉高

D.其不含残留单体

E.MNA单体完全挥发

答案

参考答案:B

阅读理解

There is one word that is on the lips of Americans, day and night: “Sorry.”

One time as I was walking on the street, a young man ran by hurriedly, brushing against my handbag. Even as he continued on his way, he turned back and said “sorry” to me. Even in a rush, he didn’t forget to apologize. One day, after I bought a mango, the salesman was giving me the change, but I wasn’t ready for it and a coin dropped to the ground. “I’m sorry,” he said while bending down to pick it up. I was puzzled—why would he apologize when it is my fault?

Another time, I stepped on a man’s foot in an escalator, at the same time, we both said “sorry”. I thought it interesting, was it really necessary for him to apologize? Later on, an American friend explained to me that according to the American mentality, the escalators a public place, and everyone should be able to stand in it. After someone occupies a position in the elevator, making it difficult for someone else to find a place to stand, isn’t it necessary to express an apology?

If you go to the movies and the tickets happen to be sold out, the ticket seller will say: “Sorry, the tickets are sold out.” Whenever one of your hopes goes unfulfilled, an American will say “sorry” as a sign of sympathy.

During my stay in America, I often came across situations in which I was supposed to say “sorry”. Gradually, I realized that when friction(摩擦)appears in daily life, Americans don’t care much about who is wrong; If someone is troubled, a “sorry” is always necessary. When this happens, even if the other person is hurt, the “sorry” cools tempers and human kindness is shown. Perhaps this is why I never saw anyone quarreling on the buses, subways or streets of America.

小题1:How many examples are given to show that Americans like to say “sorry”?

A.One

B.Two

C.Three

D.Four小题2:When the author was walking on the street, a young man ran by hurriedly ______.

A.and took away his bag

B.and touched his bag

C.to help him with his bag

D.to brush his bag小题3:Which of the following plays a different role in the passage?

A.Paragraph 2

B.Paragraph 3

C.Paragraph 4

D.Paragraph 5小题4:At last, the author’s attitude towards the Americans’ “sorry” seems to be ______.

A.angry

B.interested

C.approving(赞成)

D.disappointed小题5:The best title for the passage can be “_______”.

A.My life in America

B.Americans’ “sorry”

C.My experience in an escalator

D.The meaning of “sorry”

单项选择题