Question

【題目】Air is an odorless (無氣味的), invisible (看不見的) 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 (明確的) 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.

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

A. Press tightly. B. Take out.

C. Put down. D. Turn fully.

【2】The 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

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

(W—water; A—air; H—handkerchief)

A. B.

C. D.

Answer 1

【答案】

【1】A

【2】C

【3】C

【解析】本文主要介紹了空氣的特點，用實驗證明空氣是占據(jù)空間的。

【1】A

猜測詞義題。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，杯子倒過來手帕也不會掉，說明是緊緊地按壓。故選A。

【2】C

細節(jié)理解題。從第二段的句子“It is easy to prove that air is something that takes up space. ”可知這個實驗很容易做。選C。

【3】C

細節(jié)題：從最后一段的句子：“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. ”把杯子倒過來，直接把它放在一缸水中直到完全浸入。當杯子從水里拿出來，手帕還會是干的。杯子里的空氣占據(jù)了空間而且阻止水的進入。從句意可知杯子倒過來的時候，手帕在杯子底部，杯子的其余部分是空氣。故選C。