As is known to us all，light________faster than sound．


  1. A.
    travelled
  2. B.
    travel
  3. C.
    travels
  4. D.
    will travel
C
分析：屬于自然科學(xué)范疇的客觀真理，要用一般現(xiàn)在時(shí)表示。B項(xiàng)主謂不一致。(延伸)諺語(yǔ)類表示的是社會(huì)科學(xué)范疇的客觀真理，也用一般現(xiàn)在時(shí)表示，如：Practice makes perfect．(熟能生巧)
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