单选题
For companies, the threat of drive-by hacking seems set to grow as software programs assisting hackers {{U}}proliferate{{/U}} on the Internet.
A、
obliterate
B、
multiply
C、
stack
D、
precipitate
【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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