单项选择题

Questions 15-18 are based on the following dialogue: Why do dolphins use clicks

A．To communicate with other dolphins.
B．To recognize objects in the water.
C．To learn human language.
D．To express fear.
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单项选择题
What does the woman imply
A．She won’t be able to go with the man.
B．She doesn’t think Frank is arriving until tomorrow morning.
C．She has to pick up Frank at 2:00.
D．She doesn’t know when her class will end.
单项选择题
A．andB．thanC．withD．on
A．and
B．than
C．with
D．on
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