单项选择题


Questions 23 to 25 are based on the conversation you have just heard.

A．Two weeks.
B．Three weeks.
C．Two months.
D．Three months.
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单项选择题
A．Materials science.B．Biotechnology.C．Biomedicine.D．Fluid physics.
A．Materials science.
B．Biotechnology.
C．Biomedicine.
D．Fluid physics.
单项选择题
A．For free.B．$50.00 a piece.C．$100.00 a piece.D．He did not tell the girl.
A．For free.
B．$50.00 a piece.
C．$100.00 a piece.
D．He did not tell the girl.
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