As there is less and less coal and oil,scientists are explor
As there is less and less coal and oil,scientists are exploring new ways of making use of ______ energy,such as sunlight,wind and water for power and fuel.
A.primary B.alternative C.instant D.unique
怎么理解
A.primary B.alternative C.instant D.unique
怎么理解
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你能帮帮他们吗
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