单项选择题
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．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．He had forgotten to bring any food with him. B．He was afraid he would fall asleep if he should eat anything. C．He was not hungry. D．It was difficult to eat while flying a plane.