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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热门试题

单项选择题

When Americans punish criminals, they consider______.

A．their identity
B．their statuses
C．their age
D．their intelligence

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