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题目材料:

Which of the following is most similar to the role played by marine algae in the global climate control system proposed by Lovelock?
  • AA fan that continually replaces stale air in a room with fresh air from outside.
  • BA thermostat that automatically controls an air-conditioning system.
  • CAn insulating blanket that retains heat.
  • DA filter used to purify water.
  • EA dehumidifier that constantly removes moisture from the air in a room.

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