Question

  Air is a colorless,tasteless and invisible gas that is around us. An “empty” drinking glass and an “empty” room,in fact,are not really empty. Each is filled with air. When the glass is filled with water,the water pushes the air out of the glass.

   Air,as gas,has no definite shape,but because it is matter,it takes up space and it has weight. It is easy to show that air is something that takes up space. Stuff a piece of dry cloth into the bottom of a glass so that it will not fall out when the glass is turned upside down. Push the upside-down glass,holding straight up and down,into a jar of water till the glass is completely covered. When the glass is taken out of the water,the cloth is still dry. The air inside the glass shows that it takes up space and keeps the water from coming in.

() 1. Why air has no definite shape? Because .

   A. it's a mixture   B. it's a kind of gas   C. it is matter   D. it is nothing

() 2. Since air is matter,it has .

   A. neither shape nor room

   B. both room and shape as well

   C. either shape or weight

   D. both room and weight

() 3. The underlined word “stuff” means .

   A. to take away   B. to fill with   C. to cover   D. to cut off

() 4. The writer tells us that .

   A. the experiment must be carried out in the space

   B. this kind of experiments must be done in the lab

   C. the experiment is made in the room

   D. this kind of experiments can only be done in the open air

() 5. Which of the following pictures gives us the correct result of the experiment?

(W=water,A=air,C= cloth)

Answer 1

1. B 2. D 3. B 4. C 5. B

阅读提示:本文是记叙文。记述了一个物理实验过程，说明:空气 没有一定的形状，但有体积和重量。

1. B细节理解题。由第二段第一句“Air,as gas,has no definite shape…”可知空气没有一定的形状是因为它是气体。

2. D细节理解题。由第二段第一'句“…it takes up space and it has weight. ”可知空气有体积和重量。

3. B词义猜测题。将一块干布塞进在玻璃杯的底部，当玻璃杯倒置 的时候，布不会从杯子里掉出来。

4. C推理判断题。根据实验用到材料:即水、玻璃杯、布可推出：这 个实验可以在房间里进行。

5. B根据第二段的叙述可知:B选项符合物理实验的结论。从而说 明空气有体积和重量。