问答题

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

【参考答案】

[妙翻巧译] 尽管蒸汽机的使用已经过了全盛时期，但其技术精华仍然保留下来。
[解析] C。本题考查表示“时期，阶段......

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