什么东西买来的时候是白色的，用后是黑色的？

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• What can you swallow that can also swallow you?

  谜语：What can you swallow that can also swallow you?谜底：Water.

• Why is it useless to send a letter to Washington?

  谜语：Why is it useless to send a letter to Washington?谜底：Because he’s dead.

• What is the best thing to keep in hot weather?

  谜语：What is the best thing to keep in hot weather?谜底：Cool!

• What always travels on foot?

  谜语：What always travels on foot?谜底：A shoe.

• Where can happiness always be found?

  谜语：Where can happiness always be found?谜底：In the dictionary.

• What is higher without a head than with a head?

  谜语：What is higher without a head than with a head?谜底：A pillow.(枕头)

• What has cities with no houses, rivers without water and forests without trees?

  谜语：What has cities with no houses, rivers without water and forests without trees?谜底：A map.

• Where can milk be best stored?

  谜语：Where can milk be best stored?谜底：In a cow.