单项选择题

A．They are becoming insane.
B．They feel rather bad-tempered.
C．They become violently aggressive.
D．They are suffering toothache.
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单项选择题
A．At the age of two.B．At the age of four.C．At the age of five.D．At the age of eight.
A．At the age of two.
B．At the age of four.
C．At the age of five.
D．At the age of eight.
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