为防止货品长期存放而变质、损毁、老化，特别是感光材料、食品类货品应遵循先入先出原则。
参考答案：对
He is very good at carpentering, though ______.
A．is very young
B．very young
C．hevery young
D．he was very young
试从两个角度概括赵襄主学御这一故事蕴含的生活道理。(2分)
答：________________________________________________________________
