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
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
单项选择题
When Americans punish criminals, they consider______.
A．their identity
B．their statuses
C．their age
D．their intelligence
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