题目内容
We boil some water and make some steam ________ a big machine.
- A.to drive
- B.drive
- C.driving
- D.drove
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 |
A girl complained to her father about her hard life.She didn't know what she had to do and wanted to give up.She felt tired of fighting and fighting.One problem had been finished but another came over.
Her father,a cook,took her into the kitchen.He poured water into three pans and boiled(煮沸) them.After boiling,in the first pan was put some carrots,the second was put some eggs and the last was put with coffee.
The girl waited impatiently (不耐烦的),confused by what her father did.About 20 minutes later,her father took out the carrots and put them in a bowl.He took the eggs and put them in a bowl.After that the coffee was poured into a cup.“My sweet heart,what do you see?” he asked.
“Carrots,eggs and coffee,” she replied.
Her father told her to close her eyes and asked her to touch the carrots.She did so and felt that the carrots were soft.After that he asked her to take the eggs and break them.After peeling (剥开) them,she got the eggs,cooked and hard.The last,the father let her smell the coffee. She asked,“What did you do this for,Father?” He explained that each had the same unlucky experience—the boiling water,but each had a different result. The strong and hard carrots had become soft and weak.The fragile eggs became hard after being cooked. The coffee was very special,they could change water.“Who are you?” asked her father.“When bad luck knocks at your door,what is your decision? Are you carrots,eggs or coffee?”
【小题1】The girl complained about her hard life because she didn't ________.
A.want to give up | B.finish one problem |
C.know what to do | D.get tired of fighting |
A.ask her how to boil eggs |
B.show her how to make coffee |
C.teach her how to be a cook |
D.tell her how to face difficulties |
A.soft | B.hard | C.salty | D.sweet |
A.美味的 | B.易碎的 | C.特别的 | D.可怜的 |
A.The girl's father liked to eat some kinds of food. |
B.Bad luck always knocks at strong people's doors. |
C.Boiled carrots,eggs and coffee had the same result. |
D.People should make right decisions when in trouble. |
A girl complained to her father about her hard life.She didn't know what she had to do and wanted to give up.She felt tired of fighting and fighting.One problem had been finished but another came over.
Her father,a cook,took her into the kitchen.He poured water into three pans and boiled(煮沸) them.After boiling,in the first pan was put some carrots,the second was put some eggs and the last was put with coffee.
The girl waited impatiently (不耐烦的),confused by what her father did.About 20 minutes later,her father took out the carrots and put them in a bowl.He took the eggs and put them in a bowl.After that the coffee was poured into a cup.“My sweet heart,what do you see?” he asked.
“Carrots,eggs and coffee,” she replied.
Her father told her to close her eyes and asked her to touch the carrots.She did so and felt that the carrots were soft.After that he asked her to take the eggs and break them.After peeling (剥开) them,she got the eggs,cooked and hard.The last,the father let her smell the coffee. She asked,“What did you do this for,Father?” He explained that each had the same unlucky experience—the boiling water,but each had a different result. The strong and hard carrots had become soft and weak.The fragile eggs became hard after being cooked. The coffee was very special,they could change water.“Who are you?” asked her father.“When bad luck knocks at your door,what is your decision? Are you carrots,eggs or coffee?”
【小题1】The girl complained about her hard life because she didn't ________.
A.want to give up | B.finish one problem |
C.know what to do | D.get tired of fighting |
A.ask her how to boil eggs |
B.show her how to make coffee |
C.teach her how to be a cook |
D.tell her how to face difficulties |
A.soft | B.hard | C.salty | D.sweet |
A.美味的 | B.易碎的 | C.特别的 | D.可怜的 |
A.The girl's father liked to eat some kinds of food. |
B.Bad luck always knocks at strong people's doors. |
C.Boiled carrots,eggs and coffee had the same result. |
D.People should make right decisions when in trouble. |
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 |