单项选择题

Engineers are studying the dolphin's skin and shape __________.

A．to learn how fast it can swim
B．to discover the value of the dolphin
C．because dolphins are good swimmers
D．because they like swimming very much
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单项选择题
The word smart in the last paragraph means __________.
A．clever
B．strong
C．friendly
D．small
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.
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