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题目材料:

According to the passage, which of the following was NOT a contribution by Thomas Edison to the phonograph?
  • AHe designed a cylindrical rotating object as the recording medium.
  • BHe designed the phonograph to have a consistent speed.
  • CHe designed the disc as a more durable format than the cylinder.
  • DHe designed cylinders wrapped in a malleable substance.
  • EHe created a device that could play sounds as well as record them.

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