单项选择题

A．9.
B．10.
C．13.
D．15.
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单项选择题
Most Americans are offspring of immigrants who came to the new continent to flee political or religious persecution.（）
A．Y
B．N
C．NG
单项选择题
A．It is operated by federal employees.B．It has been in operation for fifteen years.C．It is especially for retired officials.D．It provides daily telephone calls.
A．It is operated by federal employees.
B．It has been in operation for fifteen years.
C．It is especially for retired officials.
D．It provides daily telephone calls.
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