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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单项选择题
Which of the following is true according to the passage
A．5 million dolphins were hunted commercially from 1959 to 1972.
B．People's recognition of animal rights helps protect dolphins.
C．Dolphins am good at giving out sounds.
D．Clicks are used by dolphins to influence other dolphins' behaviour.
单项选择题
What is most probably the reason Securepoint employed Jaschan
A．Because it wants to support him in the trial.
B．Because it sympathizes with him in the case.
C．Because he can contribute to the work on the defenses against computer viruses.
D．Because he is capable of attacking computer worms.
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