As there is less and less coal and oil, scientists are exploring new ways of making use of

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. abrupt
B. alternative
C. authentic
D. abstract

A. abrupt(答案→)B. alternativeC. authenticD. abstract解析：考查形容词：A. abrupt 突然的B. alternative 可供选择的C. authentic真实的D. abstract抽象的，句意：--因为煤和石油越来越少，科学家在探索新的利用可替换能源的方式，如：太阳能，风能和水做能源和燃料。选B。

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