【题目】 (可替代的) energy sources are renewable, which means they can be used without running out.
在线课程【答案】Alternative
【解析】考查形容词。 句意：替代能源是可再生的，这意味着它们可以永续利用。根据句意可知，填Alternative。
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energy sources are renewable, which means they can be used without running out.
编辑：chaxungu时间：2026-04-27 03:03:57分类：高中英语题库
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