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

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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

According to the passage, which of the following accurately describes the relative sizes of two whales（）

A．The blue whale is larger than the sperm whale.
B．The beluga is larger than the blue whale.
C．The killer whale is larger than the sperm whale.
D．The porpoise is larger than the killer whale.