单项选择题

A．At 5 years old.
B．At 6 years old.
C．At 7 years old.
D．It’s not clear.
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A．heightB．highC．heightenD．higher
A．height
B．high
C．heighten
D．higher
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A．pass onB．pass byC．pass intoD．pass off
A．pass on
B．pass by
C．pass into
D．pass off
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