As there is less and less coal and oil, scientists are exploring new ways of making use of __________ energy, such as s

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1. As there is less and less coal and oil, scientists are exploring new ways of making use of __________ energy, such as sunlight and water for power and fuel

A . primary B . alternative C . instant D . unique

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外研版英语高一Book4Unit1Life in the future同步训练