题目内容

Solids can usually be turned into liquids and liquids into gases if their temperatures ______ high enough.

[    ]

　　A. raise   B. rise   C. are risen   D. is raised

答案：B
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选择填空:

Liquids can be ________ into solids if they are made cold  enough.

[    ]

A. became　　 B. turned　　 C. become　　 D. turn
从括号中选出适当的词填空。

If we ______ (raise, rise) their temperatures high enough, 

solids can be turned into liquids.
根据短文内容，完成下列句子。
     No air means death. Although we can't see it, there is air around us. So air is everything and it gives life to
every living thing. Bad air makes people ill. We must have fresh air to keep us in good health.
     In the city, there are a great many people and there are too many cars running on the roads. The gas which
the cars give out is full of poison (有毒物). Every day we breathe it in again and again. This makes us feel sick.?  Besides cars, there are many factories, too. From chimneys (烟囱) of these factories, the smoke is usually
black or grey. This kind of smoke, when mixed with the air, is dangerous to our health. It is because the smoke
contains many poisonous solids and gases. In order to keep us healthy, we have to go out to the countryside to
breathe more fresh air. We can also climb up hills to get the fresh air.?
1. We can't              if there is no air.?
2. People will have good health only when they breathe             .?
3. The poisonous gas can make people             .?
4. The              from the chimneys of the factories is usually black or grey.
5. We should often go to the               to breathe more fresh air.
阅读理解。
     No air means death. Although we can not see it, there is air round us. So air is everywhere and it gives
life to every living thing. Without it we can not live. Bad air makes people ill. We must have fresh air to
keep us in good health.
     In the city there are a great many people and there are too many cars running on the roads. The gas
which the cars spread out is full of poison. Everyday we breathe it in again and again. This makes us feel
sick. Therefore people should go out of door as much as they can.
     Besides so many cars, there are many factories too. From the chimneys of these factories, we get the
smoke usually in black or grey colour. This kind of smoke, when it mixes the air, is dangerous to our health.
It is because smoke contains many small poisonous solids and gases. So in order to keep us healthy we have
to go out to the countryside to breathe more fresh air. Or we can go up hills to get more fresh air.
1. which of the following titles is the best for this passage?
[     ]
Ａ: Air
Ｂ: Fresh Air
Ｃ: Breathing Air
Ｄ: The Use of Air
2. ____ could live without air.
[     ]
Ａ: Fish
Ｂ: Anything
Ｃ: Fruit
Ｄ: Nothing
3. Although we can not see it there is _____ all around us.
[     ]
Ａ: gas
Ｂ: poison
Ｃ: water
Ｄ: smoke
4. Air gives ____to all living things.
[     ]
Ａ: life
Ｂ: live
Ｃ: death
Ｄ: health
5. We must have fresh air to keep our ____.
[     ]
Ａ: breath
Ｂ: health
Ｃ: wealth
Ｄ: death

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