单项选择题

To work out a person's mental ratio, one must ______.

A．know his date of birth
B．give him a test
C．find out his mental age
D．know the relationship between his mental age with his chronological age
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单项选择题
A boy of nine who is three years retarded has a mental age of ______.
A．six
B．nine
C．twelve
D．three
单项选择题
Binet used large numbers of children in his tests because he wanted to find out ______.
A．who were the brightest
B．who had defects
C．what a bright child could do
D．a standard
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