3 Land is becoming too salty.
WAYS OF INCREASING FOOD PRODUCTION
1 You can increase the area by irrigation; you can build dams and water your fields; you can pump water from low-lying areas;
2 You can develop new plants which produce heavier crops;
3 You can develop new plants which grow in poor soil;
4 You can develop new plants that are less likely to be attacked by pests and diseases.
Step 6 Reference
SB Page 21, Part 4. Read the instruction and check that the Ss know what to do. Do the first two items orally with the whole class. Then let the Ss work through this exercise in pairs. Check the answers at the end. Answers:
1 about 10,000 years ago
2 1 billion people
3 how to feed a growing world population
4 the sea
5 11 % of the earth‘s land surface
6 farmland
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英语教案－Senior 3 unit4 lesson15