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
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
单项选择题
From the first paragraph, we can learn that______.
A．dolphins and whales belong to the same animal family
B．the buffeo is very small
C．female dolphins are heavier than males
D．most whales are dolphins
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