A．The longer our nap is, the more energy we will get.
B．A 20-minute nap will help to restore our energy.
C．A short-time nap does less help to our body.
D．We usually don't want to wake up when taking a nap.
A．They tell people how to release stress.
B．They teach people to be mentally healthy.
C．They show people how to do better work.
D．They focus on interpersonal relationships.
A．Their life can also be boring and pointless.
B．They are less likely to feel lost.
C．They only have glossy outer appearance.
D．They feel more pain than poor people.