单项选择题

The example of dogs and cats in the second paragraph is intended to _______.

A．explain which animals are mammals
B．show the differences between mammals
C．illustrate how shallow dreamless sleep is
D．reveal how smart they are
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单项选择题
According to some scientists' research findings, dolphins seldom sleep because _______.
A．of their stupidity
B．of their vulnerability
C．there are possible dangers in the ocean
D．aquatic mammals do not need sleep
单项选择题
Which of the following might be the best title for this passage
A．Evolution of Sleep.
B．Two Types of Sleep.
C．The Original Function of Sleep.
D．Animals and Sleep.
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