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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单项选择题

Which of the following proposals did the Ordinance of 1784 incorporate（）

A．New states should be admitted to the Union in numbers equal to the older states.
B．The Union should make the western region into tributary states.
C．New states should share the same rights in the Union as the original states.
D．The great western region should be divided into twelve states.

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.