1、1Unit 8 A green worldPeriod 4 Grammar重点单词听，并跟读下列单词1. poster n. 海报 2. display vt. & vi. 展示；陈列3. pollute vt. 污染4. harm vt. 伤害；损害5. living adj. 活着的，活的听，并跟读下列单词变形1. pollute vt. pollution n.2. harm vt. harmful adj. 有害的harmless adj. 无害的重点短语听，并跟读下列短语1. one of the biggest problems最大的问题之一2. throw into 扔进3. b
2、e filled with 充满；被装满4. clean up 清理5. as well as 除之外(也)6. have a chance to 有机会重点句型听，并跟读下列句子1When is the show going to be held?这次展览什么时候举行？2. If we do not act to improve the environment, more living things will be killed by pollution.如果我们不采取行动改善环境，更多的生物将被污染杀死。公交小句听，并跟读下列句子A new type of robot will be displayed at the show, you have a chance to get a ticket for the show.一种新型的机器人将会在展会上展示，你有机会得到一张展览会的票。
