单项选择题

Pirated compact disks and floppy disks remained the second biggest vehicle for the spread of computer viruses despite the government’s determined efforts to quash software piracy（）

A. boost
B. prevent
C. crush
D. restrict

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单项选择题
Three weeks after the suicide bombing,the police were still hunting for bombers for they believe more were（）

A. on the verge of
B. on the sly
C. on the spot
D. on the loss
单项选择题
Though （）rich, ha was better off than at any other period in his life.

A. by any means
B. by some means
C. by all means
D. by no means
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