单项选择题


Questions 15-18 are based on the following dialogue:
Approximately how many human commands have some dolphins learned

A．Five.
B．Fifteen.
C．Fifty.
D．Five hundred.
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How many solar heat panels do three or four-bedroom homes usually need
A．Three or four.
B．Five or six.
C．Seven or eight.
D．Twelve or more.
单项选择题
The man will probably take his elective courses in which area
A．American literature.
B．World literature.
C．Literary analysis.
D．Surveying.
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