问题描述：
首字母填空It was 21st November,1783,in Paris.Two y___ men went into a very,very big balloon.They
made a fire w___ some wood and paper so that the fire could make the balloon b___ lighter.
After some m___ ,the balloon left the ground.The two young men f___ about five and a half miles.It was not a very long trip,b___ it was a very important one because it was the first trip by man in the air.
made a fire w___ some wood and paper so that the fire could make the balloon b___ lighter.
After some m___ ,the balloon left the ground.The two young men f___ about five and a half miles.It was not a very long trip,b___ it was a very important one because it was the first trip by man in the air.
问题解答：
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