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Everyone knows that exercise is important. We all need to exercise. Doctors say i _【小题1】____   is good for us. It makes your heart and body s__【小题2】___. Children who often exercise are more alert（灵活的）. This means they do better in tests and schoolwork than those who don’t exercise.
There are many w__【小题3】____ to exercise. You can walk, run, swim, skate, or play ball games. Make sure you e__【小题4】___ in the following ways: you have to like what you’re doing. Exercise enough --- but not too m__【小题5】____. It’s best to exercise t__【小题6】___ each week. Thirty minutes each time is enough. Try all kinds of things until you find one, two or even three sports that feel r__【小题7】__for you.
You can exercise at fitness centers (健身中心). They have l__【小题8】____ of equipment （设备） there . The equipment will help exercise your arms, legs and other parts of your body to make you f __【小题9】____. Some people buy equipment for their homes. But it is very expensive.
Exercising can be fun. Friends can exercise t _【小题10】____ at a fitness center, or they can play sports together. How do you exercise?

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Of all the things we eat and drink, water is the most important. Not many people realize this, but it is quite true.    1.   , but two or three days without water usually leads to death. Many people do not understand how much water the human body needs at work and many people do not drink enough especially in cold weather.    2.   . Most people drink when they are thirsty, but we often need more water, especially after doing exercise.

___3.   . Water is very important in several different ways. Most people need about five to seven liters of water every day, but we do not need to drink that amount, because a lot of water comes from the food we eat.    4.   , however, we feel tired and may become ill. 

A. If we do not have enough water

B. A man’s body contains 65% --- 75% water

C. Most people drink enough only in hot weather

D. We need to drink water before doing exercise

E. The human body can live without food for a long time

Astronauts, people who fly into space, need special training. First they go to Houston, Texas. That is the home of the Johnson Space Centre. There they are tested to see how strong and smart they are.

One of the first tests is for the heart. The people walk or run, then the space doctors see how fast their hearts are beating.

Another important test is performed. In this test the person must curl（蜷曲）his body up in a ball. When he is in that position, he is put into a round cloth bag. The doctors give him no idea how long he will have to stay in the bag. If a spaceship broke down in space, the astronauts would get into bags like this. Then they would have to wait and curl up in darkness, until help could arrive. You can see that an astronaut must not be afraid of tight space or darkness.

After the tests, only the best people are chosen to start astronaut training in a training centre. The astronauts in training learn many other things. They learn how to jump out of a moving airplane. They learn to how to blow up a lifeboat and get into it while they are in the ocean. The astronauts also have to learn how to get lifted out of the ocean by helicopter（直升机）. That may look fun, but it can be dangerous.

After they finish training, the astronauts continue to work. They stay in good shape by running and doing exercise. They read about their special jobs. In that way they can learn new facts about space travel.

Then the big day comes. The astronaut is told to go to work on a flight into space. The crew members（全体船员）get to know each other first. Then they can learn which job each will do.

1.The astronauts don’t know how long they will stay in the bag in the test because ________________.

A. the doctors need to know how strong they are

B. the astronauts need to show how smart they are

C. good astronauts mustn’t be afraid of darkness or tight space

D. nobody knows when help will come if the spaceship breaks down

2.The astronauts don’t learn how to ________________ in the training centre.

A. walk or run in space                                  B. jump out of the moving plane

C. blow up a lifeboat                             D. get lifted out of water by helicopter

3.Which is the correct order according to the passage?

a. Doctors do tests on the astronauts.

b. The astronauts go to the Space Centre.

c. The astronauts learn new facts about space travel.

d. The best people are chosen for training.

e. The astronauts go to work on a flight into space.

A. a, b, c, d, e              B. d, a, e, b, c              C. b, a, d, c, e              D. c, d, e, b, a

4.Which of the following is NOT true?

A. After the tests, only the best people are chosen to start astronaut training in a training centre.

B. The crew members get to know each other after the tests.

C. One of the first tests is for the heart.

D. An astronaut must not be afraid of tight space or darkness.