单项选择题

The dolphin's teeth __________.

A．are used to chew food
B．are all the same as the ape's
C．can swallow a whole fish
D．are used to catch food
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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
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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