Unit2 Text2 课前预习案一Phrases 1.有机耕种_ 2.在过去的半个世纪里_ 3.化肥_4.提高产量_ 5.给.造成损害_6.被洗掉_7.随着时间的推移_ 8.逐渐增强，建立，开发_9.另外_10.转向，求助于_11.集中注意力于_12.富含_13.使.免受_14.每几年_ 15.阻止.干_16.避免做_二. Read the passage quickly and then answer the following questions.1. The main idea of the passage is _. A. Organic farmers use many methods to keep the soil fertile. B. Chemical fertilizer is better than natural fertilizer.C. Natural fertilizer is better than chemical fertilizer.D. Organic farmers prefer chemical fertilizer because it can improve the soil.2. According the text, which of the following is not the problem caused by chemical fertilizer? A. Crop diseases can be stopped B. Chemicals also stay in the ground and underground water for a long time. C. The helpful bacteria and pets are killed as well as the harmful ones. D. Many of these fertilizers are dangerous to peoples health.3. Which of the following is true? A. Organic farmers prefer chemical fertilizers. B. Organic farmers prefer using natural waste from animals. C. All farming is organic farming. D. Farmers often grow the same crops year after year.4. Farmers _ so that the soil may absorb important minerals. A. often change the kind of crop in each field every few yearsB. use chemical fertilizers C. plant crops such as peas or soybeansD. plant crops to use the same level of soil5. How many ways do the organic farmers have to keep their soil fertilizer and healthy? A. 3 B. 4 C. 5 D. 6课内探究案一. Analyze and translate the difficult sentences1. This affects crops and, therefore, animals and humans, since chemicals get inside the crops and cant just be washed off. _.2. This also keeps the air, soil, water and crops free from chemicals._. 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._.二. 课文重点句型填空1. _ (在期间) the past half century, _ (use) chemical fertilizers has become very common in farming.2. Scientists have been _ (find) that _ (长期的) use of these fertilizers can _(对造成损害) the land.3. What are some of the problems _ (cause) by chemical fertilizers? First,they damage the land by killing the helpful _(细菌)and _(害虫) as well as the harmful _(代词)。4.These chemicals in the food supply _(积累，增加) in peoples bodies over time.5. Many of these chemicals can _ _ (导致) cancer or other illnesses. 6._ _(另外，而且), fruit, vegetables and other food _ (grow) with chemical fertilizers usually grow too fast to be full of much _ (营养).7._(因为这些发现)，some farmers and many customers are beginning to _(转向) organic farming.8. They focus on _ (keep) their soil rich (肥沃的) and _(免除) disease. 9.This also keeps the air , soil, water and crops _(免除) chemicals.10.Organic farmers also plant crops to use different levels of soil, for example, planting peanuts _(连词) use the grounds surface followed by vegetables that put down deep roots.11.Some organic farmers prefer planting grass between crops to prevent wind or water _(carry) away the soil, and then leaving it in the ground to become a natural fertilizer for the next years crop.12. These many different organic farming methods have the same goal: _ _ (grow) good food and avoid _ (damage) the environment or peoples health.三、重点知识应用1.We put our books in bookcase to keep them free from dust.翻译：_.3. in addition 另外,加之,此外 (=whats more, moreover, besides, furthermore) in addition to 除之外还(=介词besides )Translation: (1) 除了买东西，我们还看了场电影。 _. (2) In addition (Moreover), dont travel with a lot of cash. _课后巩固案1. No one can avoid _ by ones surroundings. A. to be influencedB. having influenced C. influencingD. being influenced2. The teachers proposal was worth _. A. to be consideredB. of considerationC. considering D. to consider3. If I ruled the world, I would _ the world _ everything that is bad. A. get rid of; byB. be rid of; byC. rid; of D. get rid; of