1、题目关键词：points and examples, describe

 2、答题要领：

 (1)briefly summarize the two changes.

 (2)use specific examples to explain each one.

 3、听力材料要点：

 (1)The center of production moved from homes to factories. The example of clocks. The machines can make clocks much faster.

 (2)Cities started forming around the factories. Factories need to hire worker and people start to live together near the factory before eventually forming a city.

 4、模板

 (1)In the listening material, the professor mentions two major changes that occurred after machines began to be used for manufacturing goods.

 (2)The first one is ... For example, ...

 (3)The second one is ... For example, ...