高中英语教学资料-M4-人教新课标必修四 Unit 2 Working the land-Using language.pptVIP

they are good for us… but the problem is that they aren’t healthy enough! All these chemical fertilizers – they kill off both the bad and the good things in the ground. The ground doesn’t have enough vitamins and minerals any more to help crops grow healthy. BOY: So … if our fruit and vegetables were grown with chemical fertilizers, they might look healthy, but probably aren’t really healthy? I guess we’ve got to stop using so many chemical fertilizers to grow our food! Write a summary of the text following the procedure on page 15. * * * * * Words preview chemical production bacteria pest nutrition mineral adj. 化学的；关于化学的 n. 生产；制造 n. 细菌 n. 害虫；害兽；害鸟 n. 营养；滋养；食物 n. 矿物；矿石 discovery focus soil reduce root n. 发现；发觉 n. 焦点；中心点 vt. 集中；聚焦 n. 土壤 vt. 减少；减缩 n. 根；根源 Words preview skim underline summary comment vt. 浏览；略读 vt. 画底线标出；强调 n. 总结；摘要；概要 n. 评论；议论 vi. vt. 表达意见; 做出评论 Words preview Expressions preview build up lead to focus on keep… free from/of 逐渐增强; 建立; 开发 导致; 造成 (后果) 集中 (注意力，精力等) 于 使…免受(影响，伤害等)； 使…不含(有害物) Organic Farming What are genetically-modified foods? The term GM foods or GMOs (genetically-modified organisms) is most commonly used to refer to crop plants created for human or animal consumption using the latest molecular biology techniques. What are some of the advantages of GM foods? The world population has topped 6 billion people and is predicted to double in the next 50 years. Ensuring an adequate food supply for this booming population is going to be a major challenge in the years to come. GM foods promise to meet this need in a number of ways: 1).pest resistance 2).disease resistance 3).cold tolerance 4).drought tolerance/salinity tolerance 5).nutrition What are some of the criticisms against GM foods? Most concerns about GM foods fall into three categories: environmental hazards危险; 危害物 , human health risks, and economic concern