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. 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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Questions 11 - 13 are based on the following broadcast on sleep. You now have 15 seconds to read Questions 11 - 13. It will be more difficult to relax yourself, if 您的浏览器不支持 audio 元素。