A.They develop their identities within peer groups.B.They receive informal education.C

外语类 公共英语 已帮助 人

A.They develop their identities within peer groups.

B.They receive informal education.

C.They perform. voluntary community services.

D.They participate in all kinds of extracurricular activities.

热搜:a是b的充分条件,b是a的必要条件吗