单项选择题

Which of the following is NOT true about Sasser and Netsky

A．They were created by Jaschan.
B．They are Jaschan's friends.
C．They are computer viruses.
D．They threaten computer security.
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单项选择题
In the writer's opinion, Jaschan should______.
A．be severely punished
B．be fired by the software firm Securepoint
C．be arrested immediately
D．be blamed for the crimes
单项选择题
The value of dolphins in military uses is inspired by______.
A．their buzzes
B．their quacks
C．their clicks
D．their squeals
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