单项选择题

The Americans are a highly ______ people. Most of them like to travel whenever they get the chance.

A．mobilized
B．mobile
C．changeable
D．moved
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单项选择题
Tom has been a vegetarian ______ principle for years.
A．in
B．on
C．for
D．by
单项选择题
No one would have time to read or listen to an account of everything ______ going on in the world.
A．it is
B．as is
C．there is
D．what is
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