单项选择题
A．He happened to fly over it. B．He remembered it himself. C．He made a guess and happened to be right. D．He figured it out with the help of some simple instruments.
A．on aviation history B．about a man called Lindbergh and his plane C．about a famous flight across the Atlantic D．about how to go to Paris from New York by plane
A．the airfield was wet B．he took too much fuel with him C．a tractor almost blocked the runway D．it was too dark to see well