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    6. 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

    Primary初等的；最初的；alternative可供替代的，可选择的；instant 立即的，即刻的； unique 单独一无二的，由常识可知，阳光、风力及水力都是不可能替代能源。
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