单项选择题

Which feature makes FM radio relatively noise free

A．Its radio frequency is varied.
B．It is static free.
C．It has "preamplifier control" section.
D．It has a detector circuit.
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单项选择题
Zurich is______in Switzerland.
A．the largest city
B．the financial center
C．a manufacturing center
D．famous for its cheese
单项选择题
Most people in Switzerland live in ______.
A．cities
B．towns
C．the suburbs
D．the countryside
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