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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单项选择题
All of the following whales belong to the suborder of Odontoceti EXCEPT （）

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