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
In an FM radio, the Intermediate Frequency is usually ______.
A．10.7 MHz
B．455 kHz
C．540 kHz
D．1605 kHz
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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