Who does the author refer to by the expressionyo
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Who does the author refer to by the expression"yo-yo dieters"in Line 10,Paragraph 3?
A.People who like to play yo-yo.
B.People who constantly diet and fail.
C.People who without a strong will.
D.People who diet for a long time.
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答案：B
本题是主旨概括题。题干是：第三段第十行的“yo-yo dieters"，作者指的是谁？选B的依据是：该句对不同年龄层的人的节食情况进行比较，年纪较长者坚持得较好，而年轻人“in comparison”坚持得不好。由此，可以推理出选项B经常节食但屡遭失败的人，是正确答案。