单项选择题

（）能够说明商品的尺寸、色彩、质地等相关的商品信息，让用户在搜索商品时，尽可能准确定位到商品的关键词。 A.
核心词 B.
属性词 C.
长尾词 D.
促销词

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A．Popular music is the most important export of America.
B．People enjoy country music because it expresses their sad feelings.
C．The blues is usually played by black musicians.
D．Country music mainly describes the difficult lives of Americans.

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在Excel中，A5单元格输入“A5”，拖动填充柄至C5，则B5、C5单元格的内容分别是( )。 A.
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