单项选择题

The ______ of such I. Q. tests full of questions on American culture was not questioned at that time.

A．significance
B．validity
C．efficiency
D．justification
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单项选择题
While researchers may not ______ the expansive claims of hard-core vitamin enthusiasts, evidence suggests that the nutrients play a much more complex role in assuring vitality and optimal health than was previously thought.
A．authorize
B．license
C．counteract
D．endorse
单项选择题
Every year a number of students graduate from the school which will ______ new students the first week in September.
A．enroll
B．recruit
C．collect
D．reproduce
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