lass.ppt

文档介绍：The earth is polluted. pollut ion ( n.) 污染 We ’ re trying to save the earth! 我们正在竭尽全力拯救地球! try to do =try one ’ s best to do 努力去做某事。 . Every student should try to work hard in order to study in a university. 为了进入大学学****每个学生都应该努力学****air pollution The factories that burn coal pollute the air with a lot of black smoke. n. 煤炭 Factories put waste into the river. water pollution noise pollution There are more cars on the road. mobile phone pollution