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六级练习2013.04.15


       
       






The purpose of keeping fit is to avoid ill health,to resist the mental and physical fatigue that makes us more likely to contract infections,and above all to feel more pleasure in being alive.(1)_______________________.If everyone followed this plan,the number of people visiting the doctor and going to hospital would be considerably reduced.Unfortunately, although most people acknowledge the importance of physical fitness,not enough of us put this into practice;we spend too much time watching others from the comfort of an armchair or a seat in the stand at a sports stadium. (2)_______________________.They also avoid suffering the consequences of weakened muscles,which are the cause of a great deal of back and abdominal trouble.About 640 muscles account for about 45% of our body's weight;they must have the ability to store energy and be continually supplied with fuel by the blood.Sensible exercise, suited to each individual and preferably undertaken on the advice of a doctor,is the best insurance for meeting these requirements.




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Research has shown the value of a * diet,fresh air, sunshine, adequate rest and some form of regular exercise for everyone

One reason why people who are physically fit live longer is that they do not put the heart under crisis stress and so they reduce the risk of heart and blood-vessel disease.

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