Unit 3 Computers课前 10 分钟概括大意 There are large sudden pollution increases during rush hours
Pollution levels fall during nighttime
The time of year also makes a big difference
Pollution levels tend to be at their lowest during spring and autumn when winds are freshest
Extreme cold or hot weather has a trapping effect and tends to cause a buildup of pollutants
此段落大意是：When pollution levels rise and fall
漫画欣赏 画面描述 A young man is running toward the end of a race，sweating all over
The end line leaves a deep impression on us，for it is both “finish line” and “starting line” if we look at it from a different angle
寓意理解 Achievement calls for celebration
But life is just like an endless race
An ambitious person will well realize that his success is the starting point for a new race
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