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The earliest ancestor of the modern bicycle is probably a machine used in England in the early 1800s called a hobbyhorse. It h two whe and a pl to s, but n pedals; rid would pu it al with th feet. La, an inventor added pedals directly to the front wheel, like a modern child's tricycle. This version, with a huge front wheel, was faster, but it was unsafe. Riders were high off the ground, and the two wheels were close together, making both balance and stopping difficult.
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参考答案：ad els ace it o ers sh ong eir ter