单项选择题

Eye contact is important because wrong contact may create a communication ______

A．barrier
B．tragedy
C．vacuum
D．question
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单项选择题
The lawyer advised him to drop the ______, since he stands little chance to win.
A．case
B．event
C．affair
D．incident
单项选择题
According to a recent poll, 61 percent of American high school students admitted ______ cheating on exams at least once.
A．to
B．on
C．of
D．for
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