高三 Unit 4 Lesson 14

Step 1 Revision

1 Revise the dialogue in Lesson 13, paying special attention to intonation.

2 Check the Ss‘ dialogues.

Step 2 Discussion and presentation

SB Page 20, Part 1. Get Ss to talk about the picture and describe what they can see; Read aloud the questions, then put Ss into groups of four and get them to discuss these questions briefly. Ask different groups for their answers and write these on the Bb. Then say Now read the passage and find out. Allow the Ss enough time to read the text, then put them in pairs and get them to compare their answers. Collect the answers from the class. Answers:

1 It is being built on; it is being lost by the actions of the wind and the rain; land is becoming too salty.

2 You can increase the area of farmland by irrigation; you can build dams and water your fields; you can pump water from low-lying areas; you can develop new plants which produce heavier crops; you can develop new plants which grow in poor soil; you can develop new plants that are less likely to be attacked by pests and diseases.

Step 3 Reading

Ask the Ss more questions about the passage. Let them read the whole passage carefully and answer the questions, working in pairs or small gro

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