摘要:10.汉末蔡文姬写下的著名长诗.叙述了自己一生不幸的遭遇.胡笳是一种吹管乐器.最早于( )时期流行于塞北和西域地区. A.汉朝 B.晋朝 C.隋朝 D.唐朝

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Like jogging (慢跑) and swimming, cycling is one of the best all-round forms of exercise. It can help to increase your strength and energy, giving you more efficient muscles (肌肉)  and a strong heart. But increasing your strength is not the only advantage of cycling. Because you're not carrying the weight of your body on your feet, it's a good form of exercise for people with painful feet or backs. However, with all forms of exercise, It's important to start slowly and build up gently. Doing too much too quickly can damage muscles that aren't used to working. If you have any doubt about taking up cycling for health reasons, talk to your doctor and ask his /her advice.

Generally you should be cycling at least two or three times a week. For the exercise to be doing you good, you should get a little out of breath (上气不接下气 ) . Don't worry that if you begin to lose your breath. Shortness of breath shows that the exercise is having the right effort. However, if you find you are in pain then you should stop and take a rest.

Title:1.__________________

People’s opinion

One of the best    2.of exercise

  

3.

Increasing your strength and energy

Relieving(缓解)people’s painful feet or backs

Attention

Start slowly

4.

Cycle at least two or three times a week

Shortness of breath is natural

5.if you feel in pain when cycling

 

 

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