To compensate for the substantial decline in the availability of fossil fuels in future years, we will have to provide at least

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问题 To compensate for the substantial decline in the availability of fossil fuels in future years, we will have to provide at least an ______ alternative energy source.

选项 A、anticipated
B、official
C、equivalent
D、emotional

答案C

解析 (equivalent等效的,同等重要的)。句意为:在未来的岁月,为了弥补化石燃料供应大幅度减少带来的损失,我们应当至少提供一种同等重要的替代性能源。A.anticipated被预料的;B.official正式的;D.emotional感情上的。
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