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

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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