A．Because they are too weak to work.
B．Because they need to seek treatment.
C．Because people are prejudiced against them.
D．Because they are embarrassed to face others.

A．Because psychologists and related persons can almost always cure it.
B．Because it’s a period almost every childe must experience.
C．Because it lasts a short period of time.
D．Because more and more parents and doctors begin to attach importance to it.