单项选择题

A．experience
B．undergo
C．travel
D．witness
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单项选择题
When did the Polos arrive in China
A．In 1271
B．In 1274
C．In 1275
D．In 1292
单项选择题
The author write this passage mainly to______.
A．compare two viewpoints.
B．introduce an author's theory.
C．discuss a fact.
D．take advantage of Mann to confirm his own opinion.
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