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As there is less and less coal and oil, ...

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.original

B.alternative

C.convenient

D.staple

 

B 【解析】形容词辨析。A原始的;B替代的;供选择的;C便利的;D经常需要的;经常用的;结合句意可知B正确。句意:因为煤炭和石油越来越少,科学家正在寻找新方法利用替代能源。
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