单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．A pre-test is required.
B．A data-processing course is required.
C．A day course is required.
D．A college diploma is required.
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单项选择题
A．They are fellow teachers.B．They are freshmen of a university.C．They are second-year students.D．They are tour guides.
A．They are fellow teachers.
B．They are freshmen of a university.
C．They are second-year students.
D．They are tour guides.
单项选择题
A．The pear.B．The weather.C．The seafood.D．The cold.
A．The pear.
B．The weather.
C．The seafood.
D．The cold.
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