单项选择题

A．Impatient.
B．Serious.
C．Enthusiastic.
D．Nervous.
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单项选择题
A．Enhance the contests of force.B．Change people’s old mental habits.C．Change people’s ideologies.D．Persuade mankind to live with war.
A．Enhance the contests of force.
B．Change people’s old mental habits.
C．Change people’s ideologies.
D．Persuade mankind to live with war.
单项选择题
A．They don’t need conventional signs and symbols.B．They only require a receiver in communication.C．The distance between communicators can’t be too long.D．They are not restricted in time and space.
A．They don’t need conventional signs and symbols.
B．They only require a receiver in communication.
C．The distance between communicators can’t be too long.
D．They are not restricted in time and space.
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