单项选择题


Passage Two
Questions 19 to 21 are based on the passage you have just heard.

A．They will remain stable.
B．They will be raised.
C．They have been changing all the time.
D．They are determined directly by the supply and demand of the market.
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单项选择题
A．10:20.B．10:12.C．10:28.D．10:08.
A．10:20.
B．10:12.
C．10:28.
D．10:08.
单项选择题
A．8.B．81.C．18.D．8.
A．8.
B．81.
C．18.
D．8.
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