单项选择题

The word "dubious" in paragraph 4 means ______.

A．uncertain.
B．unreasonable.
C．important.
D．unique.
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单项选择题
The author write this passage mainly to ______.
A．bring up some warnings.
B．tell the reader some new facts.
C．discuss a solution to a problem.
D．persuade the reader to keep fit.
单项选择题
The author points out that Chalmers's theory needs to be improved in which of the following aspects
A．the motive of some behavior of America.
B．the underlying intention of America's support of globalization.
C．the reason why America seeks to its transcendent position.
D．the fact the America is not purely imperial.
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