中国文学批评史上第一位系统而周详地讨论文体问题的是（），他的《文心雕龙》从《明诗》到《书记》，以20篇的篇幅集中探讨各种文体问题。
参考答案：刘勰
试述室内低压线路短路的原因及简单处理。
用所给词的适当形式填空。
1. Please give ________ (he) the cinema ticket.
2. Daming always likes to wear a pair of ________(trainer).
3. Are they those ________ (child) uncle and aunt from America?
4. Miss Yang and her mother ________ (not watch) TV at night.
5. Let's ________ (send) a card to Rita at her birthday party.
