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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单项选择题
The author seems to indicate that______
A．there are many controversial issues like the right amount of sleep
B．among many issues the right amount of sleep is the least controversial
C．people are now moving towards solving many controversial issues
D．the right amount of sleep is a topic of much controversy among doctors
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
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