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【题目】Air is an odorless (无气味的), invisible (看不见的) gas that surrounds the earth. It is everywhere on the planet. An “empty” drinking glass and an “empty” room, to give two examples, 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 a gas, has no definite (明确的) shape, but, because it is matter, it takes up space. It is easy to prove that air is something that takes up space. Stuff a dry handkerchief into the bottom(底部) of a glass so that it will not fall out when the glass is turned upside-down. Push the upside-down glass; hold it straight into a jar of water till the glass is completely covered. When the glass is taken out of water, the handkerchief will be dry. The air inside the glass takes up space and keeps the water from coming in.

1What does the underlined word “Stuff” (in Paragraph 2) mean?

A. Press tightly. B. Take out.

C. Put down. D. Turn fully.

2The writer tells us that _______.

A. the experiment is done in the laboratory

B. the experiment is done outside the room

C. the experiment is easily done

D. the experiment is carried out indoors

3Which of the following pictures gives us the correct result?

(W—water; A—air; H—handkerchief)

A. B.

C. D.

【答案】

1A

2C

3C

【解析】本文主要介绍了空气的特点,用实验证明空气是占据空间的。

1A

猜测词义题。第二段中的“Stuff a dry handkerchief into the bottom(底部) of a glass so that it will not fall out when the glass is turned upside-down”可知把一干手帕放在杯子的底部,杯子倒过来手帕也不会掉,说明是紧紧地按压。故选A。

2C

细节理解题。从第二段的句子“It is easy to prove that air is something that takes up space. ”可知这个实验很容易做。选C。

3C

细节题:从最后一段的句子:“Push the upside-down glass; hold it straight into a jar of water till the glass is completely covered. When the glass is taken out of water, the handkerchief will be dry. The air inside the glass takes up space and keeps the water from coming in. ”把杯子倒过来,直接把它放在一缸水中直到完全浸入。当杯子从水里拿出来,手帕还会是干的。杯子里的空气占据了空间而且阻止水的进入。从句意可知杯子倒过来的时候,手帕在杯子底部,杯子的其余部分是空气。故选C。

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