问题 选择题

下列说法正确的是(  )

A.消化过程是一种不消耗能量的过程

B.近年常发生工业用盐当作食盐用而引起食物中毒的现象,该工业用盐对人有致癌作用,它的化学成分是NaNO2

C.新陈代谢过程是生物体自我更新的过程,因此,只存在物质变化,不涉及能量的转化

D.磁悬浮列车在运行时会“浮”在轨道上方,从而减少了地球对列车的引力,故可高速运行

答案

A、消化过程伴随着能量的变化,如淀粉、糖类、油脂在人体内消化,氧化分解,释放出能量,供生命活动使用.所以选项错误.

B、亚硝酸钠,化学式为NaNO2,和氯化钠外表相似,也有咸味,所以常发生工业用盐当作食盐用,但亚硝酸钠有毒,是一种致癌物质,会引起食物中毒,所以正确.

C、新陈代谢过程是生物体自我更新的过程,在糖类、蛋白质和油脂等代谢消化的过程中,进行物质转化,同时释放出能量.所以错误.

D、磁悬浮列车是用强磁场将列车微徽托起,使其浮在轨道上方,减小了与轨道的摩擦力,从而可以高速行驶,并没有减少地球对列车的引力.所以错误.

故选B

阅读理解

As a father, I always do my best to help my son, Peter. I like to help him with his study. I encourage him to join team sports. I send him to the summer camp if he wants to go. I also teach him to be both a good student and a useful man.

He used to make me feel proud. I often thought he was the best son and I was the best father in the world.

However, things changed two years ago. It was Peter’s 12th birthday. My wife and I bought him a computer as a present. We thought it was necessary for him to learn how to use a computer in the modern world. We knew that some children were addicted (上瘾的) to computer games and that they didn’t study or work at all. Someone said that computers and the Internet were bad for children, but I didn’t worry about it. I trusted (信任) my son. I believed that he could control himself. Peter did very well at first. He played computer games, but for only two hours every week. Most of the time he studied or wrote articles on the computer. We felt very happy to see that.

When we finally learned that Peter was also addicted to computer games, it was too late. He didn’t like studying at all. He no longer joined team sports. Sometimes we even couldn’t find him at night. He spent several days and nights at the Internet cafe. We tried everything to help him, but nothing worked. What should we do?

小题1:Why did the writer think his son was the best in the past?

A.Because his son joined many team sports.

B.Because his son was a good student.

C.Because his son always made him feel proud.

D.Because his son loved him very much.小题2:How old is Peter now?

A.10 years old.

B.12 years old

C.14 years old.

D.16 years old.小题3: What did the writer buy for his son as a birthday present two years ago?

A.A computer.

B.Some computer games.

C.Some books.

D.A computer book.小题4:How long did Peter play computer games at first?

A.About two hours every day.

B.About two hours every week.

C.About two hours every month.

D.The whole day.小题5:Which of the following is TRUE according to the passage?

A.Peter likes to study a lot now.

B.It wasn’t necessary for children to learn how to use a computer.

C.Many children have lost interest in studying because of computer games and the Internet.

D.Children shouldn’t use the computer.

单项选择题