Extensivereading.pptVIP

ORGANIC FARMING Organic farms use no man-made chemicals to increase crops or control insects and disease. The study showed that organic fields produced fewer crops, on average, than other fields. However, the scientists say the organic methods improved the health of the soil and used half as much energy. 1. What is organic farming? 2. Why do organic farmers grow peas or soybeans after corn or wheat? 3. What is the advantage of using natural fertilizer? 4. What’s the main idea of paragraph 3? Language points 1. It also refers to crops growing with natural rather than chemical fertilizers. to be relevant to sb./sth. 与…有关 What I have to say refers to all of you. 我要说的事和你们大家都有关。 (2) =mean 指的是，就…而言 “Slow” doesn’t refer to the action here, but to the train. “slow”在此不指动作，而指火车。 (3)提到，谈到 He referred to his past experiences. 他谈到了他过去的经历。 (4)查阅，参考 refer to...as 将......称为 refer sb. to... 让某人参考或求助于...... 2. to mention sb/sth 提到、说到 In his speech, he didn’t refer to the problem at all. 在他的演说中丝毫未触及那个问题。 3. Firstly, leaving chemicals in the ground for a long time is not good for the soil or the water supply. supply. 1) 用作名词时： a) 指“供给;供应”等,其反义词为demand (需求)。 supply and demand 供与求 be in short supply 供应缺乏,供应不足 food supply 食物供应 water supply 供水 b) 当“供应品;生活用品;补给品”等,常用复数supplies。 military supplies 军需品 household supplies 家庭用品 medical supplies 医用品 2) 用作动词时,指“供给,提供,备办”等, supply sb. (with) sth , supply sth. to /for sb. -- They supplied food to/for them. 他们供给他食物。 -- The library is well supplied with books. 图书馆备有充足的书籍。 [比较] supply, provide 和 afford supply向群众、市场、城市、工厂等 供应物品。 provide 主要指为某人、某物供应物 品, 尤其指生活必需品。 afford 指为一定的目的而提供所需要 的东西。 They provided the refugees food and medicine. 他们为难民提供食品和药品。 These efforts