单项选择题

"That knowledge "( Line 5, Para. 2 ) refers to ______.

A．the knowledge of its behavior
B．the knowledge of the subject matter
C．the knowledge of what the social scientist has learned about its behavior in the past
D．the knowledge of the social scientist.

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单项选择题

By saying the atom cannot acquire a knowledge of physics , the writer meant that ______.

A．the atom cannot learn physics
B．the atom cannot find out what the physicist has learned about it
C．the atom cannot learn anything about the physicist
D．the physicist does not acquire much knowledge about atom

单项选择题

This passage mainly talks about ______.

A．the differences between the natural scientist and the social scientist
B．the functions of the natural sciences and the social sciences
C．the aim of the natural sciences and the social sciences
D．the differences between the natural sciences and the social sciences