单项选择题

A．Providing a warning light when the sound is too loud.
B．Producing more personal stereo systems.
C．Restricting the use of personal stereos.
D．Setting up a standardized hearing test.
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单项选择题
A．They live longer.B．They eat more salt.C．They have changed their sleeping habits.D．They eat less fruit.
A．They live longer.
B．They eat more salt.
C．They have changed their sleeping habits.
D．They eat less fruit.
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A．How to use camera.B．How to use a washer.C．How to use a keyboard.D．How to use a tape recorder.
A．How to use camera.
B．How to use a washer.
C．How to use a keyboard.
D．How to use a tape recorder.
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