单项选择题

From the text we learn that Welchi ______.

A．is a wicked worm causing as many damages as Blaster did
B．is a program designed by Haley to detect worms like Blaster
C．is a program intended to fix the infected machines
D．is a worm meant to defeat the virus with "pings"

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单项选择题

SoBig. F damaged computer programs mainly by______.

A．sending them an overpowering number of messages
B．harvesting the addresses stored in the computers
C．infecting the computers with an invisible virus
D．destroying the anti-virus software of the computers

单项选择题

Persons' remarks are mentioned at the beginning of the text to______.

A．show the general disapproval of gossip
B．introduce the topic of gossip
C．examine gossip from a historical perspective
D．prove the real value of gossip