单项选择题

Which of the following is the topic of Paragraph 3

A．Some historical documents may not be real.
B．Some authors may not be honest.
C．Historians should be careful about their sources.
D．Historians may be influenced by their own backgrounds.

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单项选择题The true historian should base his statements on ______.

A．findings of other historians
B．documents created at the present time
C．his own inferences
D．sound historical materials

单项选择题It is emphasized in the last paragraph that ______.

A．wars are accounted for differently in different countries
B．the historian needs caution and training in dealing with his sources
C．some writers may not be telling the truth
D．some writers may not be in a position or frame of mind to tell the truth