单项选择题

According to the passage, brain differences are caused by ______ factors.

A．biological
B．psychological
C．mental
D．social
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单项选择题
In the last paragraph, the author suggests more work on ______
A．the brain structure as a whole
B．the differences between men and women
C．the functioning of parts of the brain
D．the effects of the trunk line
单项选择题
These differences in Line 3, Paragraph 5 refers to those in ______
A．activities carried out by the brain
B．the brain structure of men and women
C．school subjects
D．skills of men and women
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