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
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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
单项选择题
To judge a child's standard, his marks in a test must be compared with marks gained by ______.
A．others of the same age
B．older children
C．younger children
D．adults
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