单项选择题


A．this
B．that
C．/
D．what
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单项选择题
A．exactB．identicalC．sameD．alike
A．exact
B．identical
C．same
D．alike
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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