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More Exercise

1. Physical fitness is the result of many factors-good medical and dental care, proper nutrition, adequate rest and relaxation, and sensible personal habits. But these are never enough. An essential factor is regular physical activity-exercise for a body that needs it to function well.

2. All of us know that ordinary movements-things like running, jumping, and bending-are made by muscles. Muscles also do many other things. They suck air into your lungs, push food along your digestive tract, and tighten your blood vessels to raise blood pressure when you need more pressure for an emergency. Your heart is a muscular pump.

3. When your muscles are not used, or are not used enough, they do not develop and grow properly. They soon become flabby and weak, shrink in size, and lose the ability to do the jobs they were meant to do.

4. Recent studies showed that the average high school student spends fifteen to thirty hours a week watching television and only two hours a week in organized play or exercise. That is one reason why one-third of the 200,000 pupils tested for the Presidents Council on Physical Fitness failed a simple test of strength, stamina, and flexibility. Some of the boys and girls could not raise themselves to a sitting position without using their hands!

5. Cars and buses, elevators and escalators, TV and push-button machines all tend to reduce strenuous physical activity. But our bodies still need exercise. Without it they soon become weak, ineffective, and unattractive.

23. Paragraph 1 _______.

24. Paragraph 2 _______.

25. Paragraph 4 _______.

26. Paragraph 5 _______.

A. Factors of physical fitness

B. Our body needs exercise

C. The result of lacking exercise

D. Muscles need exercise

E. The function of muscles

F. The way of keeping fit

27. Some people have difficulties in standing up due to _______.

28. Your muscles become weak when they are _______.

29. To keep fit, you have to _______.

30. Muscles can help raise blood pressure by _______.

A. be overweight

B. lacking adequate exercise

C. hurt badly

D. not used

E. do exercise

F. tightening blood vessels

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（責任編輯：rhj）

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