6．discoveryn．发现；发觉→discover vt．发现→discoverer n．发现者

　　7．summaryn．总结；摘要；概要→summarize vt．总结；概括

　　[巧记单词]

例词 规律 派生词 regretful v．＋­ful→adj． confused v．＋­(e)d→adj． discovery v．＋­y→n． 　　Ⅲ．补全短语

　　1．(be) in need of　　　　　需要

　　2．cause damage to给......造成损害

　　3．wash off将......洗掉；洗净

　　4．build up逐渐增强；建立；开发

　　5．lead to导致；造成(后果)

　　6．in addition 另外

　　7．focus on集中(注意力、精力等)于

　　8．keep ．．．free from/of使......免受(影响、伤害等)；

　　使......不含(有害物)

　　1．[教材原句]Recently, however, scientists have been finding that long­term use of these fertilizers can cause damage to the land and, even more dangerous, to people's health．

　　然而，最近科学家发现长期使用这些肥料会对土地造成损害，甚至更危险的是，会对人们的健康造成危害。

　　[句型点拨]现在完成进行时表示从过去发生的谓语动作一直持续到现在，强调动作的持续性。

　　[佳句赏析]The Grade Two classes have been observing the plants around the school and finding the animals that live there．

　　二年级各班的学生在学校周边观察植物和寻找小动物。

　　2．[教材原句]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．

　　像豌豆或大豆这样的农作物能使土壤重新富含重要的矿物质，这为种植需要肥沃土壤的农作物，如小麦和玉米等做好了准备。

　　[句型点拨]现在分词短语在句中作结果状语。

　　[佳句赏析](2013·天津高考满分作文) On the other hand, I will help set up the English corner, providing us students a platform to practice our oral English．

　　另一方面，我将帮着建立英语角，提供给我们学生一个练习英语口语的平台。

　　 CHEMICAL OR ORGANIC FARMING?

　　Over the past half century, using chemical fertilizers has become very common in farming． Many farmers welcomed them as a great way to stop crop disease and increase production． Recently, however, scientists have been finding that long­term use of these fertilizers can cause damage to the land and, even more dangerous, to people's health．

　　What are some of the problems caused by chemical fertilizers? First, they damage the land by killing the helpful bacteria and pests as well as the harmful ones． Chemicals also stay in the ground and underground water for a long time． This affects crops and, therefore, animals and humans, since chemicals get inside the crops and cannot just be washed off． These chemicals in the food supply build up in people's bodies over time． Many of these chemicals can lead to cancer or other illnesses． In addition, fruit, vegetables and other food grown with chemical fertilizers usually grow too fast to be full of much nutrition． They may look beautiful, but inside there is usually more water than vitamins and minerals．

With these discoveries, some farmers and many customers are beginning to turn to organic farming． Organic farming is simply farming without using any chemicals． They focus on