单项选择题

A．Security.
B．Engine.
C．The "tyre war".
D．Deaths and accidents.
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单项选择题
A．This is an international conference.B．This is an academic Conference.C．This is a formal occasion.D．The language used in this conversation is informal.
A．This is an international conference.
B．This is an academic Conference.
C．This is a formal occasion.
D．The language used in this conversation is informal.
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