Losing weight lies in the power of minds，not in the power of chemicals.Think twice before buying diet products.Once we realize this，we will be much better able to resist diet products，and therefore，prevent the psychological and physical harm that comes from using them.

　　20.From Paragraph 1，we learn that

　　.

　　A.diet products are in our daily life

　　B.people have trouble choosing diet products

　　C.people should put up with diet products

　　D.diet products are misleading people

　　答案　D

　　解析　推理判断题。根据第一段中的“...we have stopped thinking about what diet products are doing to us.”可知， 这些产品误导消费者，故选D项。

　　21.The psychological effect of diet products is that people tend to

　　.

　　A.hesitate before they enjoy diet foods

　　B.pay attention to their daily diet

　　C.watch their weight rather than their diet

　　D.try out varieties of diet foods

　　答案　C

　　解析　细节理解题。根据第二段第二句“They allow us to jump over the thinking stage that our weight problems lie not in actually losing the weight but in controlling the consumption of fat.”可知，选C项。

　　22.The underlined part in Paragraph 3 probably means

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