According to the passage, which of the following is NOT true?
   A:Some people never have any doubts about what advertisements tell them.
   B:Great competition exists between different manufacturers of the same products.
   C:The customer usually demands more than the manufacturer can supply.
   D:The manufacturer wants to persuade customers to buy his own brand.

出自:河南科技大学大学英语3(专升本)

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