问题 选择题

根据下图有关信息判断,下列说法错误的是

A.镁离子核内有12个质子

B.镁的相对原子质量为24.31

C.在化学反应中,硫原子容易失去2个电子

D.镁离子与硫离子的最外层电子数相等

答案

答案:C

题目分析:根据元素周期表中的一个小格提供的信息可知,元素名称的下方数字为该元素的相对原子质量,元素符号前面的数字为原子序数;在原子中核外电子数=质子数=12。硫原子的最外层电子数为6,易得到2个电子。故选C。

阅读理解

阅读理解。

     On the first day of class, Smith's foreign students fill in forms and give the information about themselves.

     Name: Claude

     Country: Germany (德国)

     Native Language (本族语): German

     Time in the USA: 9 months

     Family: I live with my parents.

     Work: I used to be an art teacher in Germany. But now I'm working in a company.

     Interests: I love painting. I like music, too.

     Name: Li Ming

     Country: China

     Native Language: Chinese

     Time in the USA: 2 years

     Family: I have one son. He is studying in China. My wife is an English teacher.

     Work: I was a math teacher, but now I'm a cook.

     Interests: I like cooking. I also like sports, such as basketball, table tennis and so on.

     Name: Carolina

     Country: Russia

     Native Language: Russian

     Time in the USA: 4 years

     Family: I live with my husband and 2 children.

     Work: I was a basketball player, but now I'm a teacher.

     Interests: I love sports. I like traveling.

     Name: Kalumi

     Country: Japan

     Native Language: Japanese

     Time in the USA: 3 months

     Family: My family, my parents and 4 brothers and sisters, all live in Japan. I'm here by myself.

     Work: I worked as a nurse in my country. Now I'm a shop assistant.

     Interests: I like such activities as reading, drawing and watching TV.

1. ______ has lived in America for the longest time among the four persons.

A. Kalumi

B. Carolina

C. Claude

2. ______ used to be teachers in their own countries.

A. Li Ming and Claude

B. Li Ming and Carolina

C. Kalumi and Claude

3. Of the four persons, ______ has a big family.

A. Claude

B. Carolina

C. Kalumi

4. ______ like sports.

A. Claude and Li Ming

B. Carolina and Kalumi

C. Li Ming and Carolina

5. These persons will ______ together.

A. draw pictures

B. study in the same class

C. teach English

填空题