Unit 2 I was trying to pick it up when it bit me again.
导学目标：
1. 掌握并正确运用下列单词和词组：plate, bite, c limb, hide, throw(threw),fridge , prepare, hurt(hurt) pain, in pain, worse, medicine, a few days earlier, throw it across, prepare dinner, get worse, in great pain, the right medicine, show sth. to sb.
2.掌握含有when，while，as引导的时间状语从句的过去进行时的用法。
自主预习：
一、词形转换
1. hide（过去式) ___________
2. early（比较级) ____________
3. hurt（过去式）_____________
4. take（过去式）____________
5. much（比较级）____________
