●The（72） in e－mail messages has affected almost every computer around the world and has ca

● The （72） in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America.

（72）

A. illness

B. virus

C. weakness

D. attachment

请帮忙给出正确答案和分析，谢谢！

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