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题目材料:

Consider each of the choices separately and select all that apply.

According to the passage, solar-energy systems located on Earth must store energy for which of the following reasons?
  • AAt any given location on Earth, the amount of sunlight available frequently changes.
  • BThe operation of such systems depends on devices that require a power source other than solar energy
  • CDemand for the energy produced by such systems varies in unpredictable ways

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