Scientists have helped people understand the dangers the earth is facing.As people live on the earth, we should be fully ready to deal with the dangers.If we do not pay more attention to the problems caused by air pollution, our earth may no longer be a healthy place for plants, animals, and people to live.

　　　 Cleaning up the air is a job that all countries must work on.The problems caused by air pollution can be solved, but a lot of work needs to be done.Governments around the world are beginning to work together to lower the levels of dangerous gases in the atmosphere (大气层).If this can be done well, the ozone layer (臭氧层) can rebuild itself, global warming can be controlled, and acid rain can be reduced.

　　　 In 1967, the government of the United States passed the Clean Air Act.More parts were added to the act in 1970, 1977 and 1990.As a result of these laws, cars now must reduce the amounts of harmful gases.Power factories must use “clean coal” methods to reduce acid?rain gases they produce.

　　　 In 1970, the Environmental Protection Agency (EPA) was set up.The EPA's job is to make sure that the environmental laws are being followed and to find out new dangers and offer solutions.The first Earth Day was also ce?lebrated in 1970.

　　　 While it is very important to address with air on a global scale, each person can also do something to protect the earth.Here are some things you can do every day：

(1)Turn down the heat and air conditioning.

(2)Use the dishwasher only when there are full of dishes.

(3)Practice the 3 Rs: recycle, reuse, and reduce.

(4)Plant a tree.

(5)Walk or ride your bike.

(　　)6.If we don't care about ________ problems, our earth may no longer be a healthy place.

A.air pollution B.water pollution

C.noise pollution　 D.sea pollution

(　　)7.Every country should ________ to solve the problems caused by air pollution.

A.rebuild the ozone layer　　　 B.clean up the air

C.produce harmful gases D.reduce acid?rain gases

(　　)8.All the things the EPA can do is to ________.

A.make more laws 　　　　　 　B.find out new dangers

C.protect the environment D.plant trees

(　　)9.The Clean Air Act was passed ________ by the American government.

A.In 1967　 B.In 1970 　C.In 1977 D.In 1978

(　　)10.In our daily life, we can do something to protect the earth by ________.

A.using more cars B.riding the bikes

C.cutting down trees　 D.turning up the heat

Maybe everyone likes dogs, and almost everyone likes to read stories about dogs.

　　I have a friend. He has a large police dog named Jack. Police dogs are very clever. Every Sunday afternoon my friend takes Jack for a long walk in the park. Jack likes these long walks very much.

　　One Sunday afternoon a young man came to visit my friend. He stayed a long time. He talked and talked. Soon it was time for my friend to take Jack for his walk. But the visitor still stayed. Jack became very worried. He walked around the room several times and then sat down in front of the visitor and looked at him. But the visitor paid no attention to Jack. He went on talking. At last Jack got angry. He went out of the room and came back a few minutes later. He sat down again in front of the visitor, but this time he took the visitor's hat in his mouth. The visitor saw it and was surprised. He laughed and left.

1.--The young visitor stayed a long time, didn't he?

　　--_____.

　　A. Yes, he didn't 　　　　　　　　B. No, he didn't 

　　C. Yes, he did  　　　　　　　　　 D. No, he did

2.Jack became worried because _____.

　　A. he wanted to go out for a walk      

　　B. he wanted to play with him

　　C. he didn't know the young man    

　　D. he wanted to eat something

3.Jack sat down in front of the visitor because _____.

　　A. he wanted the visitor to talk to him

　　B. he wanted to talk with the young man

　　C. he wanted to show the visitor how clever he is

　　D. he wanted the visitor to leave

4.The visitor went on talking and _____.

　　A. he paid no attention to his hat     

　　B. he paid no attention to Jack

　　C. he didn't know that his hat was taken away by Jack

　　D. he didn't like Jack

5.Jack went out of the room, but came back with _____ in his mouth.

　　A. food

　　B. nothing

　　C. something

　　D. the visitor's hat

—How was _______ dinner at Mike’s house?

—It was great. Mike’s mum is _______ wonderful cook.

A. a, the          B. the, a 　      C. the, the        D. a, an

Once upon a time, there lived a rich man. He had a servant (仆人). He and the servant loved wine and good food very much. Each time the rich man left his home; the servant would drink the wine and eat up all the nice food in the house. The rich man knew what his servant did, but he had never caught his servant doing that.

　　One morning, when he left home, he said to the servant, “Here are two bottles of poison (毒药) and some nice food in the house. You must take care of them.” With these words, he went out.

　　But the servant knew that what the rich man had said was untrue. After the rich man was away from his home, he enjoyed a nice meal. Because he drank too much, he was drunk and fell to the ground. When the rich man came back, he couldn’t find his food and his wine. He became very angry. He woke the servant up. But the servant told his story very well. He said a cat had eaten up everything. He was afraid to be punished(惩罚), so he drank the poison to kill himself.

1.In the story, _______ liked wine and good food very much.

    A. the rich man 　　B. the servant 　　C. both A and B 　　D. neither A and B

2.The rich man knew that it was _______ that drank the wine and ate up all the nice food.

A. the cat 　　 　　B. himself 　　　    C. nobody 　　　　D. the servant

3.The rich told the servant that there was poison in the two bottles, because_______.

A. there was in face poison in the bottles

B. he did not want the servant to drink his wine

C. he wanted to kill the cat

D. he wanted to kill the servant

4.In fact, _______ate all the nice food and drank the wine.

A. the servant   B. cat   C. the rich man   D. nobody

5.From the story, we know that the servant is very _______.

A. lazy   B. bad   C. clever   D. kind