Question：
Using points and examples from the talk, explain how the two methods of food preservation keep food from spoiling.
1、题目关键词：points and examples, explain
2、答题要领：
(1)summarize the two methods of food preservation.
(2)use examples to explain each one.
3、听力材料要点：
(1)Drying: removing all the water to stop micro-organisms from growing. Ancient form of preservation. Under the sun; fire smoke. mass production.
(2)Curing: adding materials. One of the oldest and still in use. Salt, sugar, lemon.
4、模板：
(1)In the listening material, the professor introduces two methods of food preservation.
(2)The first one is ...
(3)The second one is ...
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