In the past, energy sources were thought to be ______, but it was not the case.A

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问题 In the past, energy sources were thought to be ______, but it was not the case.

选项 A、productive
B、transient
C、eternal
D、boundless

答案 D

解析过去人们认为能源是无穷无尽的，但事实并非如此。本题是考查形容词的词义辨析。productive“有生产力的，多产的”；transient“短暂的，片刻的”；eternal“永恒的，永久的”；boundless“无限的，无穷无尽的”。

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