单项选择题
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.
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．in B．on C．with D．from