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
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单项选择题
It can be inferred from the passage that mothers who were influenced by Freudian ideas tended to be______.
A．critical of prolonged maternal care of the infants
B．tolerant of their babies' thumb-sucking habits
C．aware of the importance of weaning infants early
D．tired of picking their babies up the minute they cried
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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