单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．She got up later than usual.
B．The bus was late.
C．She forgot she had classes.
D．Her clock was slow.
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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
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
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