单项选择题

A．They may be homesick or feel insecure.
B．They are either cold or very sick.
C．They may try to attract other people’s attention.
D．They want to protect themselves from physical injuries.
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单项选择题
A．How people learnt in ancient time.B．How parents educated their children.C．Development of formal education.D．Educational problems today.
A．How people learnt in ancient time.
B．How parents educated their children.
C．Development of formal education.
D．Educational problems today.
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