单项选择题

The reason why studying the nature of human beings is popular is that.

A．the scale and scope of it is unprecedented
B．it is useful for determining policy
C．it is still an area of great mystery
D．there are so many best selling books about it

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单项选择题

According to the text, the problem that the scale of the study of human nature brought is.

A．that it is mysterious
B．insights lead to more questions and mystery
C．it is almost always used for the wrong purposes
D．there are too many competing theories

单项选择题

The two old debates are significant because.

A．it has profound value to researchers
B．it has academic appeal
C．people's beliefs about human nature can lead to dangerous actions
D．it forms the basis for our political policies