单项选择题

Eye contact is important because wrong contact may create a communication _______.

A．tragedy
B．vacuum
C．question
D．barrier
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单项选择题
The Prime Minister refused to comment on the rumor that he had planned to______.
A．discharge
B．dismiss
C．resign
D．resume
单项选择题
The ______ stuck on the envelope says By Air .
A．diagram
B．label
C．signal
D．mark
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