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:

考查形容詞。既然石油和煤都越來越少，人們只好使用一些其它可替代這些燃料的東西，alternative 有“可選擇的，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“獨特的”。

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