Though steam engines have now passed the _________ of their usefulness, their he

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问题 Though steam engines have now passed the _________ of their usefulness, their heritage remains.

选项 A、prime
B、era
C、epoch
D、date

答案 A

解析 prime意为“全盛期；最好的时期”；era意为“时代；(某一重要历史事件的)年代”；epoch意为“(有重大发展或特别事情的)重要时期”；date意为“日期”。

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