单项选择题

What does an IQ test really measure

A．The number of questions people can answer in the given time.
B．The time each person spends' on the test.
C．Mental speed.
D．People's persistence.
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单项选择题
How many categories of intelligence are mentioned in the passage
A．One.
B．Two.
C．Three.
D．four.
单项选择题
Why do most intelligence tests combine all three types of questions in equal numbers
A．Because everyone have the same chance in this way.
B．Because the IQ is an average and doesn't say any thing about special abilities.
C．Because they are the only three types of questions that can be used at present.
D．Both A and B.
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