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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表示慰问2. 告知有关你备考的情况3. 提出你的建议A Letter to a Classmate

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