[高一英语必修4课件2-4.ppt

Ⅰ.词汇过关 1．________adj.化学的；与化学有关的→________n．化学→________n．化学家，药剂师 2．________n．生产；制造→________v．生产→________n．产品________adj.生产的；多产的 3．________n．发现；发觉→________v．发现 4．________vt.减少；减缩→________n．减少；缩小 5．________vt.浏览；略读 6．________vt.画底线标出；强调 7．________n．总结；摘要；概要 8．________n． v．评论；议论；表达意见 答案：1.chemical; chemistry; chemist 2．production; produce; product; productive 3．discovery; discover　4.reduce; reduction 5．ment Ⅱ.短语自查 1．build up________________ 2．________________导致；造成 3．________________集中(注意力、精力等)于 4．keep...free from/of...________________ 答案：1.逐渐增强；建立　2.lead to 3．focus on　4.使……免受(影响，伤害等) Ⅲ.句式翻译 1．These chemicals in the food supply build up in peoples bodies over time. ________________________________________________________________________ 2．With these discoveries, some farmers and many customers are beginning to turn to organic farming. ________________________________________________________________________ 3．Crops such as peas or soybeans put important minerals back into the soil, making it ready for crops such as wheat or corn that need rich and fertile soil. ________________________________________________________________________ ________________________________________________________________________ 4．Organic farmers also plant crops to use different levels of soil, for example, planting peanuts that use the grounds surface followed by vegetables that put down deep roots. ________________________________________________________________________ ________________________________________________________________________ 5．Some organic farmers prefer planting grass between crops to prevent wind or water from carrying away the soil, and then leaving it in the ground to become a natural fertilizer for the next years crop. ________________________________________________________________________ ________________________________________________________________________ 答案： 1．食物中的这些化学物质会随着时间的推移而在人体内逐渐堆积。 2．由于这些发现，很多农民和消费者开始转向有机耕作。 3．像豌豆或大豆这样的农作物将重要的矿物质带回土壤，从而使之适宜于要求土壤肥沃的农作物，比如小麦或