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
The expression a variety of tests (Line 1, Para. 3) means ______.
A．a large number of different tests
B．a large number of easy tests
C．a large number of similar tests
D．a large number of difficult tests
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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