. (单选题)

We can tell from the article that the author’s main purpose of writing is to __________.
(本题1.0分)
A、

show the most effective way to lose weight

B、

state the different between dieting and doing exercise in losing weight

C、

tell us the study of the Boston University Medical Center and support the statement made by York Onnen

D、

stress the importance of maintaining proper weight

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