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  3. Exercise, everyone advises! But immediately, when you try, you run into trouble. 61) There is so much contradictory, sometimes i

Exercise, everyone advises! But immediately, when you try, you run into trouble. 61) There is so much contradictory, sometimes i

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问题     Exercise, everyone advises! But immediately, when you try, you run into trouble. 61) There is so much contradictory, sometimes incorrect advice about exercising that you become confused. Test yourself on the following true false quiz. It will tell you what you need to know.
    1. The best way to reduce the mid-section is to do abdominal exercise.
    False. Many people believe that when specific muscles are exercised, the fatty tissues in the immediate area are"burned up. "62) The truth is that exercise burns fat from all over the body and not from one specific area, regardless of the type of exercise. Of course, if you reduce the fat throughout your body, you will certainly see results around your waistline too!
    2. To maintain an adequate level of physical fitness, you need to exercise only twice a week.
    False. Studies.conducted by NASA, the National Aeronautics and Space Administration, show that unexercised muscles lose their strength very quickly. After 48 to 72 hours, you must use the muscles again to reestablish the good physical effect. And what does that mean to you? 63) NASA scientists concluded that while daily exercise is most beneficial, three alternating days each week will maintain an adequate level of physical fitness.
    3. To lose weight you should always "work up a good sweat"when exercising.
    False. Sweating only lowers body temperature to prevent overheating; it does not help you reduce. You may weigh less immediately after a workout, but this is due to water loss. Once you replace the liquid, you replace the weight.
    4. If your breathing doesn’t return to normal within minutes after you finish exercising, you’ve exercised too much.
    True. Five minutes or so after exercising, your breathing should be normal, your heart shouldn’t be pounding, and you shouldn’t be exhausted. 64)Beneficial exercise is not overly difficult, unpleasant, and exhausting;it is moderate, enjoyable, and refreshing.
    5. Walking is one of the best exercises.
    True. Walking helps circulation of blood throughout the body, and thus has a direct effect on your overall feeling of health.
    6. The minimum amount of time you should spend exercising in a day is 20 minutes.
    True. There are more than 400 muscles that attach to your skeleton. 65) A good exercise routine should contract and stretch all these muscles, and this simply cannot be done with four or five exercises in five of ten minutes. From experience, I’ve found that about 20 minutes is the minimum amount of time needed for an adequate workout.
选项
答案有益的运动不应是过于艰难的、令人不舒服的和使人疲惫不堪的，而应该是强度适中的、令人愉快的和令人精神抖擞的。
解析 这是一个复合句。前半句主干是beneficial exercise is not…，后半句主干是itis…。
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