编制设计任务书是项目( )阶段的工作。
A．决策
B．设计
C．收益
D．实施
参考答案：D
蛋鸡脂肪肝综合征的主要发病原因是（）
A.维生素E缺乏
B.高能低蛋白日粮
C.饲料发霉变质
D.胆碱缺乏
E.维生素A缺乏
We had only been driving for an hour when the car ______ petrol. [ ]
A. was run out of
B. was run out
C. ran out of
D. ran out
