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of several marketing functions, and not necessarily the most important ones.

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There__no books I want.

A. is
B. are
C. have

光老化说认为，日光中的紫外线可以引起皮肤老化。()

How many different scales can advertising be divided into？

中医认为，皮肤衰老是机体衰老的外在表象，与五脏之间具有紧密的相关性。()