单选题
The IQ is______
A、
the mental age divided by the chronological age and multiplied by a hundred
B、
the mental age multiplied by the chronological age and divided by one hundred
C、
the chronological age divided by the mental age and multiplied by one hundred
D、
the average age divided by the mental age and multiplied by a hundred
【正确答案】
A
【答案解析】
最后一段第二句指出，IQ由智力比率乘上100所得。而智力比率是由智龄 (mental age)除以实龄(chronological age)所得。
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