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学习一些有用的单词、短语和句子；
学习有关骑自行车的话题，并了解骑自行车的好处；
初步了解if引导的条件状语从句(The adverbial clauses of condition)的用法。
Learning Aims
Pre-listening
1
While-listening
2
Post-listening
3
Summary
4
Pre-listening
passenger n.
There are many passengers on the bus.
New words
Pre-listening
pollute v.
pollution n. 污染
air pollution
water pollution
Pre-listening
adj. 疯狂的
You can see all kinds of vehicles anywhere.
Some of the drivers are really crazy. They drive very fast.
adv.任何地方
Pre-listening
If you can ride a bike, you will have more advantages.
If people obey the traffic rules, there will be fewer accidents.
n.优点，优势