单项选择题

It can be inferred that ______.

A．many people may drink coffee when they feel fatigued
B．people consume at least 200 milligrams per day of caffeine
C．caffeine will not affect people who build up a certain tolerance for it
D．people should not drink coffee, tea, cola drinks, or eat chocolate bars
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单项选择题
Experiments show that ______.
A．caffeine users can sleep longer than non-users
B．non-users usually fall asleep more easily than caffeine users
C．caffeine can help people to fall asleep
D．caffeine users wake up more early than non-users
单项选择题
Which of the following does not contain caffeine, according to the passage
A．cola drinks
B．tea
C．chocolate and cocoa
D．water
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