单项选择题


A．exact
B．identical
C．same
D．alike
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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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