问题 选择题

下图是金刚石、C60和石墨的结构示意图.下列说法不正确的是 (  ) 

A.这三种物质都是碳单质

B.常温下,它们的化学性质都比较稳定

C.这三种物质的碳原子的排列方式相同

D.这三种物质完全燃烧的产物都是二氧化碳

答案

A、金刚石、石墨和C60都是由碳元素组成的单质,故A项说法正确;

B、它们都是由碳原子都成,具有相同的化学性质,常温下碳的化学性质稳定,故B项说法正确;

C、由三者的结构示意图可知金刚石、石墨和C60碳原子的排列方式不同,其化学性质相同,但物理性质不同,故C项说法错误;

D、因为它们都是碳的单质,其化学性质相同,所以完全燃烧后的产物都是CO2,故D项说法正确.

故选C

阅读理解

阅读理解。

     She is quiet, soft-spoken and has a kind face and a strong heart. She is my mom, Lili.

     When I was nine, Lili quitted her job and started her own business. She said she didn't want to stay

at home and work as a housewife: "It's a waste of life." Lili became so busy that she spent less and less

time with me. She didn't help me with my schoolwork. It was, in her words, "so that you can develop

your independence". We quarreled because she rarely showed up at parents' meetings.

     Like mother, like daughter. I have many things in common with Lili. I want everything to be under

control. I want to be perfect and I don't expect other people to help me. I push myself hard to achieve

my goals.

     After I started to go to high school, Lili and I were too busy to communicate much with each other.

     In biology class I began to be depressed. When the teacher showed us a picture of a butterfly, I

was scared and screamed. I had a vision of thousands of butterflies flying toward me.

     That night I told Lili about it. The next morning, I saw that she had red eyes with black circles

around them.

     She took me to see a therapist (治疗师). Three hours later, the therapist told Lili that my life was

like a wheel spinning (旋转) faster and faster and that was the reason for what had happened to me. I

only realized it when my body couldn't stand the pressure anymore. At these words, Lili burst into tears.

"It's all my fault, she's just a kid and I didn't have time to take care of her…To be honest, I had never

seen Lili cry before.

     After that, Lili began to spend more time at home, cooking and dragging me to do sports. I realized

she was the one who would always be there when I was in real trouble. No mom is perfect, but she is

the one who really cares about her kid.                           

1. Lili quitted her job and started her own business because _________.

A. she wanted to make more money

B. she was not willing to look after me

C. she didn't want to waste her life

D. she likes keeping busy

2. We quarreled because __________.

A. she began to spend less and less time with me

B. she didn't help me with my schoolwork.

C. she seldom attended the parents' meetings in my school.

D. Lili and I were too busy to communicate much with each other.

3. What can we learn from the passage?

A. Most women don't want to be a housewife.

B. Most children want their mothers to accompany them at home.  

C. We need to understand our mothers' busy life.

D. Although mothers are not perfect, they all love the children

4. Which of the following statements is WRONG?

A. Lili is a quiet, strong-willed woman.

B. Lili began to spend more time at home after visiting the therapist.

C. I was scared and screamed in biology class because I hate butterflies.

D. I only realized my life was like a wheel when my body couldn't stand the pressure anymore.

5. What is the best title for the passage?

A. Mom Does Care.                      

B. A Busy but Successful Mother.

C. Change From Mother to Businessman.    

D. A Student's Opinion on Mother.

单项选择题