单项选择题

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

A．Production manager.
B．Lab manager.
C．Sales manager.
D．Quality control manager.
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单项选择题
A．To know whether they read the book or whether they understand the book.B．As a common home assignment.C．To help improve their writing.D．To monitor their research.
A．To know whether they read the book or whether they understand the book.
B．As a common home assignment.
C．To help improve their writing.
D．To monitor their research.
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