The ______ in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billio

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问题 The ______ 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.
A.illness
B.virus
C.weakness
D.Attachment

选项 A、 
B、 
C、 
D、 

答案B

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