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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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
Now researchers are directing more attention to the social and cultural impetus that propelled university graduates into careers in management.
A．implication
B．propaganda
C．impulse
D．refuted
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