Question

Air is a colorless, tasteless and invisible（看不見的）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 a gas, has no definite shape, but because it is matter, it takes up space and it has weight. It is easy to prove that air is something that takes up space. Stuff a piece of dry cloth（布）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.Since air is matter, it has ________.

A．room , and weight as well                 B．both room and shape

C．either room or weight                    D．neither shape nor weight

2.The word “Stuff” means ______ in Chinese.

A．撕               B．蓋               C．取掉             D．塞

3.The writer tells that the experiment（實驗）___________.

A．is carried out in the space                 B．must be done in the lab

C．is made in the room                     D．can only be done in the open air

 

Answer 1

【答案】

1.A

2.D

3.C

【解析】

試題分析：這篇短文介紹了空氣也要占據(jù)空間，并有一定的重量，并用一個實驗說明了這個說法。

1.根據(jù)Air, as a gas, has no definite shape, but because it is matter, it takes up space and it has weight.及上文描述可知空氣也要占據(jù)空間，也有重量，故選A。

2.聯(lián)系下文so that it will not fall out when the glass is turned upside down.以便這個玻璃杯倒過來時，它不至于落下來。可知是塞住的意思。故選D。

3.短文并沒有直接指出這個實驗是在哪里進行的，但是分析四個選項可知不是必須在太空，實驗室進行，也不只是在戶外才可以進行，故選C，在室內(nèi)進行。為最佳答案。

考點：關(guān)于空氣性質(zhì)的說明文

點評：本文中長句較多，一時很難讀懂句子含義，注意多讀幾遍，不要強求非得理解一詞一句的含義，能把握文章大意就行。然后帶著問題閱讀短文，一般就能順利找出答題依據(jù)。對于不能直接找到根據(jù)的問題注意聯(lián)系上下文，根據(jù)短文中心總結(jié)出正確答案。