单项选择题

This passage suggests that an individual's I. Q. ____________.

A．can be predicted at birth
B．is inherited from his parents
C．stays the same throughout his life
D．can be increased by education
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单项选择题
The best statement of the main idea of this passage is that _________.
A．human brains differ considerably
B．the brain a person is born with is important in determining his intelligence
C．environment is crucial in determining a person's intelligence
D．persons having identical brains will have roughly the same intelligence
单项选择题
According to the passage the average I.Q. is _________.
A．85
B．100
C．110
D．125
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