单项选择题
Small in-ceiling speakers are BEST suited for（）
A.loud， bass intensive music （e.g. heavy metal， rock）.
B.providing a sub-woofer for great bass reproduction.
C.background music and blending in with decor.
D.the user who wants perfect sound reproduction.
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A.Black，Green，Red，Yellow
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Whichofthefollowingdeterminesifthealarmshouldsoundoranentrydelayshouldstart？（）
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