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
These countries were once worried that they would not have ______ supplies of petroleum.
A．proficient
B．efficient
C．potential
D．sufficient
单项选择题
In the Chinese household, grandparents and other relatives play ______ roles in raising children.
A．incapable
B．indispensable
C．insensible
D．infinite
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