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When most people think about changing their body shape, they usually focus on just losing weight. Books and magazines about diet

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问题     When most people think about changing their body shape, they usually focus on just losing weight. Books and magazines about dieting are among the most popular in the world. Dieting is an important part of staying fit and healthy, but losing weight by means of dieting takes time; losing weight too fast can cause great health problems. Dieting means change one’s eating habits to a healthier pattern, but many women mistake the concept of dieting and thinking that the less one eats, the better. As a result, they lose health as well as weight.
    Aerobic exercise is a moderate intensity workout that, over a certain period of time, will provide the body’s use of oxygen. Nowadays, aerobic exercise has become a very trendy workout among youths. Not only is performing aerobic exercise interesting, but it is also very beneficial for health. There are different types of aerobics like jogging, swimming, kickboxing, fitness walking, inline skating, bicycling, etc. Aerobics strengthens the heart and lungs. It is also especially popular with women.
    But neither of these two methods, dieting and aerobics, can help shape the body. To do this, you need to build muscle. So, if a firmer and shapelier body is your goal, 60 percent of your exercise routine should involve strengthening moves, and only 30 percent should be aerobic exercises.
    For a proper body-shaping routine, you should plan three strength-training sessions a week with weights. Use weights which are as heavy as possible while still allowing you to do 8 to 12 reps of each exercise. Do one to three exercises for each muscle groups — for example, chest and biceps, or back, shoulders and triceps.
    You should combine this with fast-paced aerobics activities, like swimming, cycling, walking, running, or in-line skating. Plan three to four workouts a week, 15 to 20 minutes each, increasing the pace each week.
    As you build muscle, you may find that you gain weight in spite of all of your calorie-burning exercise. Don’t worry. It’s probably muscle, which is denser that fat. And muscle is also a calorie-burning tissue. With more muscle, you can burn more calories, even when you are not exercising.
    When you are trying to build muscle, you need two to three servings of protein a day, but the main part of your diet should be carbohydrates. And in order to get the energy you need for a high-intensity workout, you should eat something, especially carbohydrates, an hour or so before your workout.
    While weight training will firm and shape your body, it has other benefits too. It improves bone and muscle strength and burns calories, leading to improved health and a higher quality of life.  
Which of the following is NOT true?
选项 A、Muscle-building exercise results in weight-gaining, but that is not a problem to worry about.
B、Muscle helps one keep fit.
C、Improved muscle strength can lead to a higher quality of life.
D、Weight-training helps shape up your body.
答案C
解析 推理题。C选项的定位为“It improves bone and muscle strength and burns calories．leading toimproved health and a higher quality of life．”而It指代“While weight training will firm and shapeyour body，it has other benefits too．”中的weight training，而非muscles strength。故答案为c。
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