单项选择题

Research should continue on controlled nuclear fusion, but no energy program should be premised on its existence until it has proved practical.

A．focused
B．concentrated
C．agreed
D．based
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单项选择题
It could not be ruled out that, sooner or later, the country would break out of the treaty.
A．confirmed
B．tolerated
C．excluded
D．refuted
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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