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
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
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.
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