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.
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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.
单项选择题
Even exercise professionals concede 'half a point here (Sentence 2, Paragraph 2) means they ______ .
A．agree that the calories in a small piece of pastry can be difficult to work off by exercise
B．partially believe diet plays a supporting role in weight reduction
C．are not fully convinced that dieting can help maintain one's new weight
D．are not sufficiently informed of the positive role of exercise in losing weight
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