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What do farmers put into the soil to make crops grow ? It’s fertilizer. Unit2 working the land Using language Revision of words and expressions 1.化学的 chemical 2.生产 production 3.细菌 bacteria 4.害虫；害兽 pest 5..营养 nutrition 6.矿物 mineral 7.发现；发觉 discovery 8.土壤 soil 9.减少 reduce 10.根；根源 root 11.浏览 skim 12.画底线标 underline 13.总结；概要 summary 14.评论 comment 1.逐渐增强；建立 build up 2.导致；造成（后果）lead to 3.集中（注意力、精力等）于 focus on 4.使·····免受（影响、伤害等）；使······不含（有害物） keep...free from/of hybrid corn seedless watermelon There are two kinds of fertilizers. natural fertilizers chemical fertilizers Reading Chemical or Organic Farming Skimming 1. What is organic farming? Organic farming is simply farming without using any chemicals. The goal is to grow good food and avoid damaging the envirnment or people’s health. 2. What is