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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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.
单项选择题
The sound clicks differ from the squeals in that______.
A．they are different in speeds of spreading
B．they are different in wave length
C．they are different in tones
D．they are different in volumes
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