过程设计，可以包括下面这些环节——
Lead~in by asking some questions or revison of what learned last period.
Presentation A
Show the class what is going to learn with the help of multimedium /PPT
Practice and drills
Help SS master the newly-learned knowledge .by doing some exercises.
Presentation B
Practice
Consolidation
Some exercises for deepening usage of the knowledge
Homework
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