题目内容
The force is strong enough ________ the water.
- A.hold
- B.holding
- C.to hold
- D.holds
C
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Antifreeze is a liquid(液体) that is added to water to keep it from freezing． When water freezes and turns to ice，it expands(膨胀)．The force of water expanding is so great that it will break the hardest metal．Water is used in car engines(发动机) to keep them cool while they run，and if this water is allowed to freeze in winter it can break the iron block of the engine．That is why antifreeze is necessary．
Water freezes at 0℃；the usual kind of antifreeze will not freeze until the temperature is－40℃．A mixture(混合物) of five parts of water and four parts of antifreeze will prevent freezing at－18℃；four parts of water and five parts of antifreeze reduce this to －22℃．
Alcohol is a kind of good antifreeze，but when the air is running it becomes hot and the alcohol boils away，so it must be changed very often．Most people use antifreeze that does not boil away when the engine is running．There are several chemicals that do this．One of the most popular is called ethylene glycol．
【小题1】people use ________ to keep car engines cool．
| A．antifreeze | B．water | C．alcohol | D．ethylene glycol. |
| A．0℃ | B．－18℃ | C．－22℃ | D．－40℃ |
| A．keep alcohol in water |
| B．stop ice from becoming water |
| C．make the freezing point of water lower |
| D．raise the freezing point of water |
| A．water | B．ethylene glycol | C．any chemical | D．any mixture |
| A．tell us what antifreeze is |
| B．make people buy antifreeze |
| C．tell us that cars need antifreeze |
| D．show us how to protect car engines |
词形变换：选择方框里的词的正确形式填空，每词只用一次。（10分）
1. We ________ a science experiment in class tomorrow.
2. Do you know who ________ America?
3. They will show us a ________ experiment in class.
4. I have nothing ________ to my letter.
5. Air is ________ than we think.
6. The force is strong enough ________ the water.
7. I will ask the class to make ________ and guess what will happen.
8. An Easter egg hunt is a game for ________ eggs.
9. To make a candle ________, you “light” it.
10. When the candle stops burning, it ________ up all the oxygen in the air.
|
1. We ________ a science experiment in class tomorrow.
2. Do you know who ________ America?
3. They will show us a ________ experiment in class.
4. I have nothing ________ to my letter.
5. Air is ________ than we think.
6. The force is strong enough ________ the water.
7. I will ask the class to make ________ and guess what will happen.
8. An Easter egg hunt is a game for ________ eggs.
9. To make a candle ________, you “light” it.
10. When the candle stops burning, it ________ up all the oxygen in the air.
词形变换：选择方框里的词的正确形式填空，每词只用一次。（10分）
|
1. We ________ a science experiment in class tomorrow.
2. Do you know who ________ America?
3. They will show us a ________ experiment in class.
4. I have nothing ________ to my letter.
5. Air is ________ than we think.
6. The force is strong enough ________ the water.
7. I will ask the class to make ________ and guess what will happen.
8. An Easter egg hunt is a game for ________ eggs.
9. To make a candle ________, you “light” it.
10. When the candle stops burning, it ________ up all the oxygen in the air.