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

<上一题目录下一题>

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

What is TRUE of human sleep

A．Most people need less sleep when grown older.
B．Most people need seven and a half hours of sleep every night.
C．On average, people in the US today sleep less per night than they used to.
D．Most people need more sleep when they are under pressure.