单项选择题
A．to keep the evil spirits away B．to have fun C．to celebrate the coming of the new year D．to keep to a custom
A．All students had traveled in commercial planes before. B．All students were nervous. C．Most students felt nervous traveling in commercial planes. D．Most students felt nervous when they were taken up in a fighter plan
A．to take an experienced pilot in a plane B．to be taken up into the air in a plane by an officer C．to fly a commercial plane D．to talk about his ideas