Little donkeys with harmonious tinkling bells thread their way among the throngs of people.
句意：一些挂着铃铛的小毛驴穿行于这熙熙攘攘的人群中，边走边发出和谐悦耳的叮当叮当的响声。thread穿过。push推进；增加。zigzag曲折地前进。B选项与划线处意义最为接近，故选B。