单项选择题

It can be inferred that the author is ________________ the potential effectiveness of the Department of Homeland Security.

A．uncertain about
B．dubious about
C．confident of
D．critical about
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单项选择题
According to the report, the contest will last ______________ days.
A．one
B．two
C．four
D．six
单项选择题
Mike went to Mexico to play the winter season primarily because _________________.
A．it helped him earn extra money
B．his season was over
C．he needed more experience
D．he could improve his skills
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