单选题：What does paragraph 3 mainly talk about?

题目分类：理工类
题目类型：单选题
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题目内容：

What does paragraph 3 mainly talk about? A．Different effects of caffeinated coffee and decaf on sleep.
B．Different findings of Lotan Shilo and ateam about caffeine.
C．The fact that the subjects slept 415 tninutes per night after drinking decaf.
D．The proof that the subjects took half an hour to fall asleep.

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答案解析：

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