He turned ________ ten years ago but later he became ________.   [ ]

A. a teacher; a doctor    

B. teacher; doctor  

C. teacher; a doctor    

D. a teacher; doctor

实现第二次飞跃的条件有

A．坚持从实际出发，理论与实际相结合
B．形成正确合理的实践观念
C．理论必须被群众掌握，化为群众的行动 D．要有正确的实践方法即工作方法