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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 

B. 


解析:

考查形容词。既然石油和煤都越来越少,人们只好使用一些其它可替代这些燃料的东西,alternative 有“可选择的,可替代的”之意,符合句意。primary“首要的,初期的”,instant“立即的,迅速的”,unique“独特的”。 

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