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

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

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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 than most other forms of exercise.
    In one test, a group of men 40 to 57 years of age, 【C6】_________at a fast pace for 40 minutes four days a week, showed improvement 【C7】_________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【C8】_________.
    These changes suggest some of the important—even vital—benefits walking can bring about.
    Walking【C9】_________burns calories.  It takes 3, 500 calories to gain or lose one pound.  Since a one-hour walk at a moderate pace will【C10】_________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【C11】_________—providing there is no change in your intake of food. To【C12】_________weight faster, walk an hour every day and burn up 3 pounds a month, or 36 pounds a year.
    Whatever your age, right now is the time to give your physical well-being as much thought as you【C13】_________to pensions or insurance. Walking is a vital defense【C14】_________the ravages of degenerative diseases and aging. It is nature’s【C15】_________of giving you a tuneup.
【C11】
选项
答案yearly
解析 由a pound-and-a-half monthly可知，18 pounds必定比monthly周期长，而且通过计算可知为yearly。
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