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．He’s a boat builder.B．He smokes a pipe.C．He paints in watercolours.D．He fixes pipes.
A．He’s a boat builder.
B．He smokes a pipe.
C．He paints in watercolours.
D．He fixes pipes.
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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.
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C．How to use a keyboard.
D．How to use a tape recorder.
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