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A．Some historical documents may not be real.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

A historically minded researcher ______.

A．always keeps an open mind to history
B．looks at one historical event without relating it to another
C．sees things from a single point of view
D．refuses to accept new evidence

单项选择题

When was An American Dictionary of the English Language published

A．1817.
B．1807.
C．1828.
D．1824.