单项选择题

Our ______ as a nation is threatened by these separatist forces.

A．integral
B．integrity
C．instability
D．intensity
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单项选择题
The work in the office was ______ by a constant stream of visitors.
A．confused
B．perplexed
C．reversed
D．hampered
单项选择题
According to the international regulation, the playing of the national anthem ______ all sports events.
A．repels
B．remarks
C．precedes
D．requires
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