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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单项选择题
Was the woman pleased when she saw the items they had delivered
A．Yes, of course.
B．Possibly not.
C．Not mentioned.
D．Definitely not.
单项选择题
According to the author, under the two-party system, the two parties will ______ .
A．hold opposing stands in each and every issue
B．cooperate with each other to hold the power in their hands
C．insult each other in politics and in life
D．respect each other on an equal basis
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