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

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

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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.
【C6】
选项
答案walking
解析 由上两段可知，该短文主要讲述步行的好处，此处做试验，肯定是测试步行。
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