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 ________ stuck on the envelope says By Air .
A．diagram
B．label
C．signal
D．mark
单项选择题
My brother’s plans are very ________; he wants to master English, French and Spanish before he is sixteen.
A．arbitrary
B．aggressive
C．ambitious
D．abundant
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