单项选择题
A．flew along the coastline for quite a long time B．immediately turned towards the open ocean C．ran into freezing fog and ice over the Atlantic D．found it was already getting dark
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
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.