人教 版英语必修4 Unit 2 Working the land Reading and Listening 课件（共16张PPT）

课件16张PPT。Unit 2 Using language Reading and Listening Can you think of other ways to increase the output of the crops?_____the crop_____the soilget rid of the_____kill off the _____waterweedsfertilize pestsHow many kinds of fertilizers do farmers use? There are two kinds. Chemical fertilizers Natural fertilizersNatural waste from animals Chemical farmingOrganic farming chemical fertilizers natural fertilizers Which one is better? Why? Chemical or Organic Farming?Long-term use of chemical fertilizers can cause damage to the land and people’s health.Problems caused by chemical fertilizers.The topic sentence (主题句) of each paragraphPara.1Para.2Farmers and customers turn to organic farming.Other methods to keep the soil fertile. Para.3Para.4Fast ReadingPara.1 Answer the question1. Why are chemical fertilizers so popular in farming today? Because they can stop crop disease and increase production.Careful Reading2. What problems can be caused by using chemical fertilizers? They can _____by killing the helpful_____. _____ in people’s bodies and can_____ cancer or other illnesses. Fruit, vegetables and other food grow _____.Para.2 Answer the questiondamage the landbacteria and peststoo fast to be full of nutritionChemicals build uplead toWhich is Not the reason why organic farmers choose natural waste from animals as fertilizers? _____ A. It can keep the air, soil and water free from chemicals. B. It can keep the food free from chemicals. C. It can kill harmful pests. D. It can make the soil richer in mineral.CPara. 3 Choose the right answerPara. 4 Match different methods with their advantages 1. plant grass between crops 2. change the kind of crop 3.plant crops with different roots put minerals back into soil, making the soil rich and healthy use different levels of land C. prevent the soil from being carried away, a natural fertilizerMethodAdvantage1. Paul thinks that Carrie is not telling him the truth. 2. Using chemical fertilizers always makes vegetables empty inside. 3. Today’s fruit is not as healthy for people as fruit fifty years ago. 4. Eating more vegetables might not always be good for us. 5. All of today’s vegetables look healthy but in fact are not. Decide if the following statements are true or false. ListeningJunk food 1. Read the text again and underline the difficult points of the reading text. 2. Finish the exercises from P. 28 to P. 29 on the reference book（新新学案） HomeworkThank You!