答案：A
解析：1.此题目意思为 光比声音传播快（根据常识）；
2.根据题目意思及than可知,此处应为比较级,fast的比较级为 faster,故排除C,D项不合规范,也排除；
3.通过AB选项知,意思为“光比声音传播要快的多”,“快的多”固定用法 far more...,故选择A；
light travels ( ) than sound A.far more faster B.far farster
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