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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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

单项选择题

What does this in Even expecting this (para. 2) refer to

A．The distance between San Francisco and New York.
B．The vastness of the country.
C．The size of the Mediterranean Sea.
D．The country's borders.