单项选择题

According to the passage, the fundamental difference between the natural sciences and the social sciences is that ______.

A．the social sciences are primarily concerned with the behavior of material things whereas the natural sciences mainly deal with the behavior of men
B．the natural scientist does not care how his subject matter behaves while the social scientist is interested in the behavior of his subject matter
C．the social sciences deal with the behavior of men whereas the natural sciences deal with the behavior of material things
D．men are always subjective and emotional whereas the nature is objective and unemotional
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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.
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
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