题目内容：
根据材料，完成题The First Bicycle
The history of the bicycle goes back more than 200 years． In 1791, Count de Sivrac ____ (51) ____onlookers in a park in Paris as he showed off his two-wheeled invention , a machine called the Celeriferé． It was basically an ____ (52) ____version of a children's toy which had been in ____ (53) ____for many years． Sivrac's " Celeriferé" had a wooden frame, made in the ____ (54) ____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 ____ (55) ____against the ____ (56) ____with your legsthere were no pedals． It was impossible to steer a celerifer6 and it had no brakes, but despite these problems the invention very much____(57)____ to the fashionable young men of Paris． Soon they were____ (58)____ races up and down the streets．
Minor____ (59) ____ were common as riders attempted a final burst of____ (60) ____Controlling the machine was difficult, as the only way to change____ (61) ____was to pull up the front of the " Celeriferé" and____ (62) ____it round while the front wheel was____ (63) ____in the air． "Celeriferé" were not popular for long, however, as the____(64) ____of no springs, no steering and rough roads made riding them very uncomfortable． Even so, the wooden celerifor6 was the ____ (65) ____of the modem bicycle．
请在第__(51)__处填上正确答案 A．delighted
B．cheered
C．appreciated
D．overjoyed
参考答案：
答案解析：