单选题
For companies, the threat of drive-by hacking seems set to grow as software programs assisting hackers
proliferate
on the Internet.
A. obliterate B. multiply C. stack D. precipitate
A
B
C
D
【正确答案】
B
【答案解析】
proliferate繁殖，增殖。muhiply繁殖，增加。obliterate删除。stack堆叠。precipitate猛抛，使陷入。
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