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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．primaryB．alternativeC．instantD．unique
    B.
    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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