单项选择题

He displayed a complete lack of courtesy and tact in dealing with his employer.

A. tenacity
B. curiosity
C. civility
D. hostility
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单项选择题
A. At the drug store. B. In the hall. C. From a machine. D. In a store.
A. At the drug store.
B. In the hall.
C. From a machine.
D. In a store.
单项选择题
The utilization of hydroelectric resources should be stepped up.
A. sustained
B. increased
C. supported
D. encouraged
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