课件23张PPT。Listening & Speakingchemical fertilizer organic fertilizerchemical fertilizer VS organic fertilizerPaul thinks that Carrie is not telling him the truth. Using chemical fertilizers always makes vegetables empty inside. Today’s fruit is not as healthy for people as fruit fifty years ago. Eating more vegetables might not always be good for us. All of today’s vegetables look healthy but in fact are not.True or FalseT FT FT Listening on Page 15 What is the main topic of the conversation? The possible bad effects of chemical fertilizers on the fruit and vegetables that we eat today. Pair-workHave a conversation in pairs, with one student as a farmer and the other as the customer. The farmer is trying to persuade the customer to buy his/ her tomatoes.F: Good morning! Would you like some organic tomatoes this morning? C: hmm……they’re a little expensive! What is the advantage of……desertsWhat make the world's deserts grow?Listening Listen to the tape and tick what you hear. Heat and little rain. Turning forests into farmland. Overusing fields to feed farm animals. Using new scientific farming methods. Wasting water in farms and at home. Farming too much on poor land. Listening on Page 48Listen to the tape again and choose the best answer to each question.Why was North Africa important in the first century BC? A. Rome sent a lot of corn and wheat to North Africa. B. Land in North Africa was used to produce the bread that fed all of Rome. C. The desert in North Africa was famous in Rome.2. How does farmland turn into desert? Wind blows away dry soil and then the land becomes sandy. Hot weather makes the land become sandy. C. Too many plants can make farmland become desert.3. How are new farming methods helping to stop the desert in Xinjiang? A. The methods let the farmers use les water. B. The methods let farmers grow the same amount of crops in less land. C. The methods do not use fertilizers.What should we do to prevent the land turning into deserts?group-workDiscussionShould chemical fertilizer be used?Homework1. Master the listening skills. 2. Talk about “how farming advances would affect a country”.Thank you for listening!
