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  3. The First Bicycle The history of the bicycle goes back more than 200 years. In 1791, Count de Sivrac【C1】______on-lookers in

The First Bicycle The history of the bicycle goes back more than 200 years. In 1791, Count de Sivrac【C1】______on-lookers in

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问题                                                      The First Bicycle
    The history of the bicycle goes back more than 200 years. In 1791, Count de Sivrac【C1】______on-lookers in a park in Paris as he showed【C2】______his two-wheeled invention, a machine called the celerifere. It was basically an【C3】______version of a children’s toy which had been in use for many years. Sivrac’s "celerifere" had a wooden frame, made in the【C4】______of a horse, which was mounted on a wheel at either end. To ride it, you sat on a small seat, just like a modern bicycle, and pushed【C5】______against the【C6】______with your legs—there were no pedals. It was impossible to steer a celerifere and it had no brakes, but despite these problems the invention very much【C7】______to the fashionable young men of Paris. Soon they were【C8】______races up and down the streets.
    Minor【C9】______were common as riders at tempted a final burst of【C10】______Controlling the machine was difficult, as the only way to change【C11】______was to pull up the front of the " celerifere" and【C12】______it round while the front wheel was spinning in the air. " Celeriferes" were not popular for long, 【C13】______, as the【C14】______of no springs, no steering and rough roads made riding them very uncomfortable. Even so, the wooden celerifere was the【C15】______of the modern bicycle.  
【C5】
选项 A、fast
B、deeply
C、heavily
D、hard
答案D
解析 此处意为“用脚使劲蹬地”，故选hard。heavily意为“沉重地，猛烈地”。
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