问题 选择题

下列各组中互为同位素的是(    )

A.O2和O3

B.1H 和2H

C.H2O和H2O2

D.O2–和O

答案

答案:B

题目分析:同位素是指具有相同质子数,不同中子数同一元素的不同核素,即原子间的关系比较,A选项,O2和O3是氧元素的不同单质,互为同素异形体,不是同位素,故A错误;B选项,都是氢原子,中子数不同,它们是氢元素的不同核素,互为同位素,故B正确;C选项,是两种物质,不是原子间关系,不符合同位素的概念,故C错误;D选项,O2-是离子,O是氧元素,不符合同位素的概念,故D错误。

阅读理解

When I was a teenager growing up in Russia, I wanted to leave school and have my own life. The only way I could do this was to work in the local brick factory in my town, or get married. I was nervous when I told my father I wanted to leave school. I thought he would say, " No! You are going to college. " He took me by surprise when he said, "OK. We'll go to the brick factory. "

Two days later, he took me to the factory. I had a very romantic idea of working in a factory. ' I had imagined everyone to be friends working together and having fun. I even imagined there would be music and singing. I guess I had watched too many movies as a teenager.

When we arrived at the factory gates, my father spoke to the guard and one minute later we were inside. My father said, "Take your time. Look around." I walked around the factory looking at the building, the workers, and listening to the noise. It was horrible. I ran back to my. father and said, "I want to go home. "

He asked me, "What do you think of the factory?"

"It's terrible," I replied.

"And marriage is even worse!" he said.

I went back to school the next day thinking about studying hard so I could get into a good college. I enjoyed studying English so I decided to major in languages at college. Thanks to my father and our trip to the brick factory, I now work at the United Nations and my father is very proud of me. I married a very good man and my life is much better than it would have been working in the factory!

小题1: The writer lived in_________ when she was a teenager.

A. Russia B. Japan C. China

小题2:At first she thought life in the factory would be _       _ than in school.

A. more careful B. more colorful C. more beautiful

小题3:When she told her father that she wanted to leave school, he expressed his disagreement________.

A. by doing nothing    B. in a special way C. by saying nothing

小题4: After they visited the factory, the girl________.

A. decided to work there        B. decided to get married        C. changed her mind

小题5:The underlined word "horrible" means "_     _" in Chinese.

A. 糟糕的    B. 紧张的   C. 浪漫的

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