2. 外语
  3. Walking—like swimming, Bicycling and running—is an aerobic exercise,【C1】______builds the capacity for energy output and physical

Walking—like swimming, Bicycling and running—is an aerobic exercise,【C1】______builds the capacity for energy output and physical

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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 cardiorespiratory 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 intake of food. To【C16】______weight faster, walk an hour every day and burn 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 tuneup.
【C5】
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答案by
解析 显然，由本句句意可知此空处应填一个表示“通过”的介词，应用介词by。
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