专四

单选题According to the passage it is commonly believed that brain differences are caused by factors.

A．biological 
B．psychological 
C．physical 
D．social

参考答案：D进入在线模考
【定位】第3段。
【解析】推理题。第3段倒数第2句说“我们往往认为社会影响产生了这些差异。”故选项D正确。
【点睛】选项A．biological“生物学的”，B．psychological“心理上的”，C．曲physical,”“物质的”，均不符题意。

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3What is the main purpose of the passage?

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