问题 填空题

在“生石灰、明矾、碳酸钙、不锈钢、聚乙烯、纯碱”中选择适当的物质填空。

(1)用于制造医疗器械、炊具的是           

(2)用作食品干燥剂的是           

(3)用于造纸、纺织工业的盐是           

(4)用作补钙的盐是           

(5)属于有机高分子化合物的是           

(6)净化水时可作絮凝剂的是           

答案

(1)不锈钢  (2)生石灰  (3)纯碱   (4)碳酸钙  (5)聚乙烯  (6)明矾

题目分析:(1)不锈钢可以用于制造医疗器械,所以本题答案为:不锈钢;

(2)生石灰具有吸水性,可用作干燥剂,所以本题答案为:生石灰;

(3)纯碱可用于造纸,纺织工业,所以本题答案为:纯碱;

(4)碳酸钙含有钙元素,是常用的补钙品,所以本题答案为:碳酸钙;

(5)乙烯是塑料的成分,属于有机高分子化合物,所以本题答案为:聚乙烯;

(6)明矾溶于水形成的凝胶能吸附水中的不溶性固体杂质,是常用的净水剂,所以本题答案为:明矾。

阅读理解

阅读理解

       Helen Keller lived in the USA. She was a great woman. .

       When Helen was a baby, she got very sick. After many weeks, the doctor said,"She is better, but now she can't see and she can't hear. "Her parents were very sad.

       After a few years, things got worse. There was no way for Helen to speak to other people. She heard nothing. She saw nothing. She didn't understand anything.

       Then one day a teacher came to live with Helen and her family. The teacher helped Helen learn about words. Helen was a very bright child and soon she learned to spell her first word. When she was older,

she went to college.  

        Helen was very famous. she helped many blind(盲) and deaf (聋) people.  She traveled around the

world and helped many people.

        Helen was a very old woman when she died. The world remembers her today as a brave and

wonderful person. She was blind and deaf, but she found a way to see and hear.

1. Helen Keller got very sick when              .

A. she was a baby

B. she went to college

C. her teacher came to her home

D. she was very old

2.               taught Helen Keller to speak her first word.

A. Her mother

B. Her teacher

C. Her father

D. Her doctor

3. Hellen Keller was famous because               .

A. she was American

B. she traveled around the world

C. her teacher taught her many things

D. she learned to read and write and helped people in the world

4. The world remembers Helen Keller today because              .   

A. she was very bright

B. she was blind and deaf

C. she was a brave and wonderful person

D. she went to college

5. Helen Keller was blind and deaf, but 

A. she found a way to understand the world

B. her father and her mother didn't feel sad

C. she found a way to travel around the world   

D. she found out how people became blind and deaf

选择题