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

閱讀提示:本文是記敘文。記述了一個物理實驗過程，說明:空氣 沒有一定的形狀，但有體積和重量。

1. B細節(jié)理解題。由第二段第一句“Air,as gas,has no definite shape…”可知空氣沒有一定的形狀是因為它是氣體。

2. D細節(jié)理解題。由第二段第一'句“…it takes up space and it has weight. ”可知空氣有體積和重量。

3. B詞義猜測題。將一塊干布塞進在玻璃杯的底部，當玻璃杯倒置 的時候，布不會從杯子里掉出來。

4. C推理判斷題。根據(jù)實驗用到材料:即水、玻璃杯、布可推出：這 個實驗可以在房間里進行。

5. B根據(jù)第二段的敘述可知:B選項符合物理實驗的結論。從而說 明空氣有體積和重量。