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三、教学准备：PPT课件，编造句子所需要的纸条。
四、教学过程：
Step1: Warm up.
1、Greeting.
2、介绍小组评价机制的规则。
Step2: 出示教学目标，明确学习任务。
Step3: Presentation.
Pre-listening
Task 1: Guess a riddle. (猜谜)
It is used by most people everywhere.
It was invented(发明) by Delaisse(德莱斯).
People can use it to do exercise.
It doesn’t cause air pollution.
It is a kind of vehicle.
It has two wheels(轮子).
设计目的：导入新课，激发学生学习兴趣。
Task 2: Learn the new words.
设计目的：出示图片，在语境与情境中学习新单词。
Task 3: Learn about a bicycle accident.
设计目的：既是Section A与Section B的衔接又是Pre-listening和While-listening的过度。
While-listening
Task 1：Listen to 1a and choose the correct answer.
( )1. The young man on the bicycle was very___.
A. careful B. careless C. helpful
( )2. We should ____ ride too fast.
A. never B. always C. sometimes
Task 2：Listen again and complete the sentences. Finish 1b.
We should never ride ______ _____.
We should wear bicycle ________ when riding.
3. We should have _______ on the bike or wear _____________ clothes while riding at night.