单项选择题

The author's attitude towards the world views is basically ______

A．humorous
B．negative
C．positive
D．tolerant
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单项选择题
What is the chief purpose of the passage
A．To propose new fields in brain research.
B．To outline the research findings on the brain structure.
C．To discuss the various causes of structural differences in brain.
D．To explain the relationship between gender and brain structure.
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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