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 this passage, deep dream sleep is more likely to occur in ______.
A．flies
B．vulnerable birds
C．puppies
D．tigers
单项选择题
Which of the following is the main topic of this passage
A．The career and life of Cezanne.
B．Impressionistic pictures by Cezanne.
C．Different painting styles of Cezanne.
D．Differences between Cezanne and other painters.
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