According to the passage, when people grow fond of one particular brand of a product, its sales will______. Marketers need to k

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问题 According to the passage, when people grow fond of one particular brand of a product, its sales will______.
Marketers need to know which of the four stages a product is in so as to______.

选项 A、promote its production
B、work out marketing policies
C、speed up its life cycle
D、increase its popularity

答案B

解析 依据为文章第二段第一句。
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