单项选择题

Some people dislike exercise because ______.

A．they think it is physically exhausting
B．they find it hard to exercise while on a diet
C．they don't think it possible to walk 3 miles every day
D．they find consulting caloric-expenditure charts troublesome

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单项选择题

What is the author's purpose in writing this article

A．To justify the study of the Boston University Medical Center.
B．To stress the importance of maintaining proper weight.
C．To support the statement made by York Onnen.
D．To show the most effective way to lose weight.

单项选择题

What is said about the average American in the passage

A．They tend to exaggerate the healthful effect of "light" beer.
B．They usually ignore the effect of exercise on losing weight.
C．They prefer "light" beer and low-calorie bread to other drinks and food.
D．They know the factors that play a positive role in keeping down body weight.