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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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
Dolphins once were hunted for money because______.
A．they are rare and precious animals
B．valuable oil can be obtained form their head
C．they can produce oil for lubrication
D．they are able to utter sounds worth study
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