问题 选择题

分离提纯是中学化学的重要实验之一,下列分离或提纯物质的方法正确的是

A.用蒸馏的方法制取蒸馏水

B.用过滤的方法除去NaCl溶液中含有的少量Na2SO4

C.用溶解、过滤的方法提纯含有少量BaSO4的BaCO3

D.用加热、蒸发的方法可以除去NaCl中的CaCl2、MgCl2等杂质

答案

答案:A

题目分析:A.水易挥发,通过蒸馏可得到蒸馏水,以除去杂质,A正确;B.NaCl溶液中含有的少量Na2SO4选用适量BaCl2除坛Na2SO4,再过滤去BaSO4分离,B错误;C.碳酸钡和硫酸钡都不溶于水,不能用过滤的方法分离,C错误;D.粗盐中的CaCl2、MgCl2等杂质可以转化为沉淀或气体除去,蒸发不能实现分离,故D错误。

选A。

阅读理解

阅读理解。

     An old woman from the United States is helping develop a small Chinese village. She lived there when

she was a child.

     In the early 20th century, Eunice Moe Brokck's parents came to Shandong Province and they gave birth

to her there. As she grew up, Brock saw the poverty (贫困), illness and war in China. So when she left China

at the age of 13, she decided to come back to help the poor people there.

     After her husband died, the old woman sold her house, her car, her forest and other things and moved to

China in 1999. She lived in Liumiao Village in Liaocheng of Shandong Province to help the villagers there.

     Though she is now in her nineties, she is still busy helping them. In the past few years Brock built a

computer room for the village school with her own money, and bought desks, chairs and books for students.

She also has been trying to improve the medical care conditions in a number of villages. In Liumiao, every

child can play with toys in Brock's home. At Christmas she always buys a lot of candies and takes them to

schools for students.  

     "I'm an American, but I love China," she said.

1. Eunice Moe Brock was born _________.

A. in Shandong Province

B. in the United States

C. in the south of China

2. Brock returned to China _________ years ago.

A. nine

B. thirteen

C. twenty

3. From the passage we know that Brock is _________.

A. less than 90 years old

B. over 90 years old

C. a middle-aged woman

4. Which of the following is true?

A. Brock's husband died while she was in China.

B. The villagers got much money from Brock.

C. Brock has made a great contribution to the villages in China.

5. The best title for the passage is _________.

A. A Woman in China

B. A Poor Village in China

C. An American Woman with a Chinese Heart

单项选择题