单项选择题

This passage tries to tell you how to______.

A．avoid mistakes about both money and people
B．say things elegantly
C．avoid mistakes in understanding what people tell you
D．keep people friendly without trusting them

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单项选择题

The brain waves are the slowest during______.

A．stage 1
B．stage 2 and stage 3
C．stage 4
D．REM sleep

单项选择题

Stage 4 sleep lasts______.

A．about 80 minutes
B．about 40-60 minutes
C．about 30 minutes
D．about 20-40 minutes