单项选择题

A(n) ______ disease is one that can be passed from one person to another.

A．influential
B．infectious
C．immune
D．popular
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Our ______ as a nation is threatened by these separatist forces.
A．integral
B．integrity
C．instability
D．intensity
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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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