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
He displayed a complete lack of courtesy and tact in dealing with his employer.
A．tenacity
B．curiosity
C．civility
D．hostility
单项选择题
Pirated compact disks and floppy disks remained the second biggest vehicle for the spread of computer viruses despite the governments' determined efforts to quash software piracy.
A．boost
B．prevent
C．crush
D．restrict
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