单项选择题

What can we learn from Paragraph 1

A．People who sleep less than 8 hours a day are more prone to illness.
B．Poor sleep quality may be a sign of physical disorder.
C．Stroke is often associated with sleep.
D．Too much sleep can be as harmful as lack of sleep.

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单项选择题

What is the author's purpose of writing Paragraph 3 and 4

A．To entertain the audience with some anecdotes.
B．To discuss the cause of doctors' sleep problems.
C．To show the hostility doctors have against their patients.
D．To exemplify the danger doctors face mused by lack of sleep.