Exercise alone, in the absence of weight loss, has not been shown to reduce blood pressure. Nor does it make much difference in cholesterol (胆固醇) levels. Weight loss can lower blood pressure and cholesterol levels, but if you want to lose weight, you have to diet as well as exercise. Exercise alone has not been shown to bring sustained weight loss. Just ask Steven Blair, an exercise researcher at the University of South Carolina. He runs every day and even runs marathons. But, he adds, “I was short, fat and bald when I started running, and I’m still short, fat and bald. Weight control is difficult for me. I fight the losing battle.”
The difficulty, Dr. Blair says, is that it’s much easier to eat 1,000 calories than to burn off 1,000 calories with exercise. As he relates, “An old football coach used to say, ‘I have all my assistants running five miles a day, but they eat 10 miles a day.’”
45 In the case of Steven Blair, running does ______ to his weight control.
A. little
B. much
C. good
D. harm
46 The last paragraph of the text tells us that the problem is that people tend to ______?
A. burn off 1,000 calories in a day
B. use more energy than they get
C. get more energy than they use
D. run five miles in a football game
47 Which of the following is true according to the text?
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