单项选择题

Questions 11 - 13 are based on the following broadcast on sleep. You now have 15 seconds to read Questions 11 - 13. What will tomorrow’s broadcast be about

A．Neurotransmitter.
B．Body’s natural rhythm.
C．How to keep health.
D．Hints for good health.
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单项选择题
What is the best thing to do on sleepless night
A．To take some sleeping pills.
B．To drink milk or eat cheese or fish.
C．To find a comfortable position in bed.
D．To do physical exercises.
单项选择题
It will be more difficult to relax yourself, if
A．you do physical exercises late in the day.
B．you have sleeping pills.
C．your heart rate increases.
D．you rest frequently during the day.
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