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

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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,全盛时期。如:in the prime of youth.在青春风华正茂时期。本题意为“尽管蒸汽发动机现在已经过了它们的全盛时期,它们的传统仍然保留了下来”。era,时代,年代;epoch,(新)纪元,时期,重要时期;date,日期,日子。
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