单项选择题

"Sleep defensively" means that people should ______.

A．go to see a doctor when they have sleep problems
B．keep to a flexible sleep pattern
C．sacrifice other things to get enough sleep if necessary
D．follow changeable sleep routines

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热门试题

单项选择题

According to the author, many sleeping disorders are caused by ______.

A．bad eating habits
B．pre-bedtime exercises
C．improper sleep patterns
D．chronic fatigue syndrome

单项选择题

Which of the following measures can help you sleep better

A．Staying up late.
B．Taking a hot bath.
C．Having late meals.
D．Traveling between time zones.