2. 外语
  3. Walking—like swimming, bicycling and running—is an aerobic exercise,【C1】________ builds the capacity for energy output and physi

Walking—like swimming, bicycling and running—is an aerobic exercise,【C1】________ builds the capacity for energy output and physi

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问题     Walking—like swimming, bicycling and running—is an aerobic exercise,【C1】________ builds the capacity for energy output and physical endurance by increasing the supply of oxygen to skin and muscles. Such exercises may be a primary factor in the【C2】________of heart and circulatory disease.
    As probably the least strenuous, safest aerobic activity, walking is the【C3】________acceptable exercise for the largest number of people. Walking【C4】________comfortable speed improves the efficiency of the cardio respiratory system【C5】________stimulating the lungs and heart, but at a more gradual rate【C6】________most other forms of exercise.
    In one test, a group of men 40 to 57 years of age,【C7】________at a fast pace for 40 minutes four days a week, showed improvement【C8】________to men the same age on a 30 minute, three-day-a-week jogging program in the same period. Their resting heart rate and body fat decreased【C9】________. These changes suggest【C10】________of the important—even vital—benefits walking can【C11】________about.
    Walking【C12】________burns calories. It takes 3, 500 calories to gain or【C13】________one pound. Since a one-hour walk at a moderate pace will【C14】________up 300 to 360 calories. By walking one hour every other day, you can burn up a pound-and-a-half monthly, or 18 pounds【C15】________providing there is no change in your in-take of food. To【C16】________ weight faster, walk an hour every day and bum up 3 pounds a month, or 36 pounds a year.
    【C17】________your age, right now is the time to give your physical well-being as much thought as you【C18】________to pensions or insurance. Walking is a vital defense【C19】________ the ravages of degenerative diseases and aging. It is nature’s【C20】________of giving you a tune up.
【C19】
选项
答案against
解析 空缺处所在句句意为“行走是一种关键的……疾病和衰老的方法。”此空处应填“抵抗，抵御”，即“defense against”。因此答案为“against”。
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