单项选择题

Careful testing has revealed that, of the high-I. Q. people,______.

A．most go on to complete four years of college
B．many find their way into difficult professions
C．many are never discovered
D．many live out their lives in respectable occupations

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单项选择题

One can properly infer from this article that______.

A．intellectually, our population is not homogeneous
B．regardless of I. Q. , people must learn to live and work together
C．high-I. Q. people are inclined to be more critical than low-I. Q. people
D．people should constantly seek to improve their I. Q. levels

单项选择题

To succeed, a magazine with a multimillion circulation must be aimed at______.

A．the low I.Q.
B．the high I. Q.
C．the median I.Q.
D．all I. Q. levels