单项选择题

A．It is a social fact.
B．It doesn’t exist.
C．It is natural.
D．It is a problem, especially to young people:
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单项选择题
A．15.B．16.C．17.D．18.
A．15.
B．16.
C．17.
D．18.
单项选择题
A．On the average, they will be taller.B．Their heads will be larger.C．Their fingers will be more sensitive.D．Their arms and legs will grow stronger.
A．On the average, they will be taller.
B．Their heads will be larger.
C．Their fingers will be more sensitive.
D．Their arms and legs will grow stronger.
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