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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The author compares the beluga whale with （）

A．a bird
B．a giant
C．an elephant
D．a submarine
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All of the following whales belong to the suborder of Odontoceti EXCEPT（）

A．narwhals
B．dolphins
C．blue whales
D．pilot whales
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