下列是日常生活中的一些变化，其中属于化学变化的是（） A

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问题选择题

下列是日常生活中的一些变化，其中属于化学变化的是（　　）

A．冰雪融化

B．灯泡发光

C．玉米酿酒

D．蔗糖溶水

答案

A、冰雪融化的过程中没有新物质生成，属于物理变化．故选项错误；

B、灯泡发光的过程中没有新物质生成，属于物理变化．故选项错误；

C、玉米酿酒的过程中有新物质生成，属于化学变化．故选项正确．

D、蔗糖溶水的过程中没有新物质生成，属于物理变化．故选项错误；

故选C．

补全对话，情景问答

根据对话内容，选择恰当的句子补全下列对话。

(Zhanghua is a member of Greener China. Julie is his friend. They are talking something about the

environment. )

J: Hi, Mr. Zhang. Are you busy now as a member of Greener China?

Z: 1

J: Do you want to do something more for wildlife?

Z: 2

J: Just go to www. wwfchina. org, a website run by World Wildlife Fund China.

Z: Oh, can you tell me more?

J: 3

Z: What is it about?

J: It offers information and cartoon pictures on how to make the world a better place.

Z: 4

J: Sure. In "Chit-Chat" you can have a talk with people who care about the environment from all

over the world. Z: I will have a try.

J: 5

Z: Thanks a lot.

J: That's all right.

A. Yes. Why?

B. I hope it's helpful.

C. When shall we start?

D. That sounds interesting.

E. Certainly. That will need a computer.

F. Of course. But I don't quite know that.

G. Look at Help Make a Difference, please.

单项选择题

力是矢量，力的合成与分解都遵循（）。

A.三角形法则

B.圆形法则

C.平行四边形法则

D.多边形法则