[简答题]　Questions 1～5 　　Today one in every ten of us has difficulty getting to sleep and, according to Dr. Ian Oswald of Edinburgh university, the reason is simple. Most people who can’t sleep are their own worst enemies. They go to bed too early. 　　For every person who works most efficiently on the usual eight hours of sleep a night, two work best on five or six, and two on nine or ten. Voltaire made do with three hours but Sir Winston Churchill would happily sleep for 12～14 hours at a stretch if he could. 　　So how much sleep does a person really need It seems that the national average for men is seven hours and ten minutes, and for women ten minutes less, but everyone’s needs are different. Find out what you need and, according to Dr. Ernest Hartmann, one of America’s leading sleep scientists, you’re well on your way to allowing your body to work at its greatest efficiency. 　　After studying the sleep habits of nearly 1000 people, Dr Hartmann believes it’s the amount of deep sleep we ge
A. A．sleeps less than the average man
B．sleeps longer when she goes out to work
C．has difficulty in getting to sleep
D．sleeps over eight hours a night

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