单项选择题

We learn from the passage that the author______

A．comments on three different opinions
B．favours one of the three opinions
C．explains an opinion of his own
D．revises someone else's opinion
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单项选择题
The author disagrees with Dr. Burton because______
A．few people can wake up feeling fresh and alert
B．some people still feel tired with enough sleep
C．some people still feel sleepy with enough sleep
D．some people go to bed very late at night
单项选择题
In the last paragraph the author points out that______
A．sleeping less is good for human development
B．people ought to be persuaded to sleep less than before
C．it is incorrect to say that people sleep too little
D．those who can sleep less should be encouraged
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