As there is less and less coal and oil, scientists are exploring new ways of making use of______ energy, such as sunlight, wind

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问题 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.

选项 A、primary
B、alternative
C、instant
D、unique

答案B

解析 考查形容词辨析。因为煤和石油越来越少,所以科学家就需要找到新的像太阳能、水能、风能等产生动力的替代类资源。alternative“供选择的,选择性的,交替的”,符合题意。primary“主要的”;instant“紧迫的”;unique“独一无二的”,均与题意不符。
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