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【单选题】
为了得到函数y=sin（2x- π 6 ）的图象，可以将函数y=cos x 3 的图象（ ）A.
横坐标缩短为原来的 1 6 倍（纵坐标保持不变），再向右平移 π 3 个单位
B.
横坐标缩短为原来的 1 6 倍（纵坐标保持不变），再向右平移 2π 3 个单位
C.
横坐标伸长为原来的6倍（纵坐标保持不变），再向左平移2π个单位
D.
横坐标伸长为原来的6倍（纵坐标保持不变），再向左平移 2π 3 个单位
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