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1. Enable students to grasp the usages of such important new words and expressions
2. Get students to master the patterns :
1. I’m sorry to interrupt you but how could they live here? P38
2. We have been excavating layers of ash almost six meters thick, which suggests that they might have kept the fire burning all winter. P38
3. Yes, indeed, as the botanical analyses have shown us, all the fields around here used to be part of a large shallow lake. P39
4. That’s why they are called hunters and gatherers. P39
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