单项选择题

A．Because their value has been raised since they were made.
B．Because they contain more silver than they used to.
C．Because they contain less silver than they should do.
D．Because the metal wears down in use.
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单项选择题
A．In the student recreation center.B．In the campus dining hall.C．In the university bookstore.D．In a classroom.
A．In the student recreation center.
B．In the campus dining hall.
C．In the university bookstore.
D．In a classroom.
单项选择题
A．A New York executive.B．A computer specialist.C．A television announcer.D．A teacher.
A．A New York executive.
B．A computer specialist.
C．A television announcer.
D．A teacher.
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