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our world L4 unit 7

  •  Chinese    7     Public
    invention
  •   Study   Slideshow
  • What is it?
    It is a battery.
  •  15
  • What is it?
    It is a wheel.
  •  15
  • What is it?
    It is electricity.
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  • What do you have?
    idea
  •  15
  • succeed
  •  15
  • fail
  •  15
  • try
  •  15