What is the passage mainly about? What does the author say about the effect of nicotine on smokers?

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问题 What is the passage mainly about?
What does the author say about the effect of nicotine on smokers?

选项 A、It threatens their health.
B、It heightens their spirits.
C、It suppresses their appetite.
D、It slows down their metabolism.

答案C

解析 根据题干中的核心信息effect of nicotine on smokers定位至原文第三个小标题下第一段最后一句,nicotine is an appetite suppressant对应答案C项。
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