1、,Unit 2 Working the landUsing language,杂交培育的新品种,New hybrid species,Hybrid pepper,sweet pepper,hybrid cotton,Hybrid eggplant,No seeds watermelon,What we put on the soil makes crops grow ? It is fertilizer.,How many kinds of fertilizers do farmers use ? There are two kinds. They are chemical fertilize
2、rs and natural ones.,Chemical fertilizers,Natural fertilizers,Which kind do farmers use when they are doing organic farming ? Do you know about organic farming ?,What is organic farming?,Organic farming is simply farming without using any chemcials.,Why are chemical fertilizers so popular in farming
3、 today?Because they are a great way to stop crop disease and increase production.,Para 1,1.What problems are caused by using chemical fertilizers?,First, they damage the land by killing the helpful bacteria and pests as well as the harmful ones. Second, chemicals also stay in the ground and undergro
4、und water for a long time. This affects crops and therefore ,animals and humans. Third,fruit, vegetables and other food grown with chemical fertilizers usually grow too fast to be full of much nutrition. .,Para 2,It is simply farming without using any chemicals.,.What is organic farming?,Para 3,It i
5、s to grow good food and avoid damaging the environment or peoples health.,What is the main reason for using organic farming methods?,Para 4,吃动物怕激素；吃植物怕毒素；喝饮料怕色素；能吃什么，心里没数。 全国人大代表金志国 带到两会上的顺口溜,Language points,long-term 意思是什么？什么词性？ 翻译本句然而，最近科学家发现长期使用这些肥料会造成土地受损，甚至更危险的事，会对人们的健康造成危害。,1. Recently, however, scientists have been finding that the long-term use of these fertilizers can cause damage to the land and , even more dangerous, to peoples health.,
