题目内容：
阅读下文，回答题。The First Bicycle
The history of the bicycle goes back more than 200 years. In 1791, Count de Sivrac
1 onlookers in a park in Pads as he showed off his two-wheeled invention, a machine called the celerifere. It was basically an 2 version of a children's toy which had been in 3 for many years. Sivrac's "celerifere" had a wooden frame, made in the 4 of a horse, which was mounted on a wheel at either end. To ride it, you sat on a small seat, just like a modem bicycle, and pushed 5 against the 6 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 7 to the fashionable young men of Paris. Soon they were 8 races up and down the streets.
Minor 9 were common as riders attempted a final burst of 10 Controlling the machine was difficult, as the only way to change 11 was to pull up the front of the "celeriferes" and 12 it round while the front wheel was 13 in the air. The "celeriferes" were not popular for long, however, as the 14 of no springs, no steering and rough roads made riding them very uncomfortable. Even so, the wooden celerifere was the 15 of the modem bicycle.
请在1处填写正确答案。 A．delighted
B．cheered
C．appreciated
D．overjoyed
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答案解析：