单项选择题

The author compares the beluga whale with ______.

A．a bird
B．a giant
C．an elephant
D．a submarine
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单项选择题
Which of the following is mentioned by the author as a reason why the baleen whale population has been reduced
A．Increased pollution of the seas.
B．Hunting.
C．Insufficient supply of food.
D．Disease.
单项选择题
With what topic is the passage mainly concerned
A．Breeding habits of whales.
B．Differences between whales.
C．Efforts to preserve whales.
D．The intelligence of whales.
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