单项选择题

The word "smart" in the last paragraph means __________.

A．clever
B．strong
C．friendly
D．small
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单项选择题
Which of the followings is NOT TRUE
A．A dolphin can stay under the water for about six minutes.
B．A dolphin often comes to the top of the water to take in air.
C．Dolphins are not fish but mammals in the sea.
D．A dolphin doesn't have a good hearing.
单项选择题
The policeman put down the phone, _______ with a smile on his face.
A．satisfied
B．satisfying
C．to be satisfied
D．having satisfied
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