人教版必修四unit2reading和练习讲解.ppt

It is meant to keep soil healthy, develop sustainable farming, and prevent the damaging overuse of land. become popular Gaining popularity …, CA aims to help famers keep land healthy and productive by… Control tillage What is tillage? turn over nutrient current unusable By avoid ing tilling, organic soil matter may actually benefit as crop pieces form a protective surface over the soil. cover crops 1. These crops prevent water and soil loss by… 2. Cover crops also… By cycling crops that need different nutrients through the same field, the soil… Ⅰ . statistics sunburnt output circulated nationality struggled decade regret Therefore nutrition Ⅱ . A) 1. 根据 2.build up 3. 幸亏，由于 4. lead to 5. 对 … 感到满意 6. focus on 7. 宁愿，宁可 8. keep…free from/of 9. 摆脱，除去 10. with the hope of B) 1. with the hope of 2. lead to 3. build up 4. would rather 5. keep free from 6. be focused on 7. was satisfied with 8. According to 9. Thanks to 10. rid of Unit 2 Working the land pre-reading What problem do they show ? How do you feel when you see the pictures? How much land can be used for ① ② ③ ④ ⑤ farming? 1. 3/4 of our earth is covered with water! 2. 1/2 of this piece is too hot, cold, or wet for farming! 3. 3/4 of this part is used for roads, buildings like houses, schools! 4. Only 1/32 of the earth is used for farming! Super hybrid rice Task 1 Scanning Para1 A. Dr Yuans dreams. Para2 B. Dr Yuans personality. Para3 C. Dr Yuans biography. Para4 D. Dr Yuans appearance and his achievement. Para 1 Appearance and Achievement. 1.Appearance face: sunburnt looks like a______ farmer arm: sunburnt body: slim but strong Although he is one of Chinas most famous scientists, Yuan Longping consider s himself a farmer, for he works the land to do his research. Dr Yuan is like more a farmer than a scientist . Indeed, his sunburnt face and arms and his slim, strong body are just like those of million