单项选择题


Questions 19 to 22 are based on the conversation you have just heard.

A．About four days.
B．About three days.
C．About two days.
D．About one day.
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单项选择题
A．The board.B．The manager.C．The chairman.D．The chief engineer.
A．The board.
B．The manager.
C．The chairman.
D．The chief engineer.
填空题
According to the researchers, ______ is significantly different from one drink to another.
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