What did Daniel Hayes invent?

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问题 What did Daniel Hayes invent?

选项 A、A single-engine fire truck.
B、A water-powered fire truck.
C、A record player.
D、A circular ladder holder.

答案D

解析 细节题。文章后面讲到在一辆(消防)卡车顶端有一个圆形的旋转平台,平台上立着一架云梯,这个发明源自Daniel Hayes。故D项正确。
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