单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．At the library.
B．At the airport.
C．At the post office.
D．At the teacher’s office.
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单项选择题
There is a U. N. convention that can cover ______.
A．problem between neighbors
B．problems on air pollution
C．problem between states which do not share a border
D．trans-boundary air pollution
单项选择题
A．Husband and wife.B．Teacher and student.C．Policeman and driver,D．Mother and son.
A．Husband and wife.
B．Teacher and student.
C．Policeman and driver,
D．Mother and son.
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