期末口试的时候要用，帮忙看一下有没有错误
1.
As a polite man, you must obey the social etiquette.
For example, you should keep your voice down in public places. Talking loudly in public is impolite. And it’s danger, too. Other people can hear your information and do some bad thing.
And you should not cut in line in public places like cafeterias, bus stations and cinemas. If you do, they will mad at you, and some of them will argue with you.
When you are talking with others, it is better to be modest. If you do, you will make a great impression on them. But if you don’t, they will think you are too proud.
On the one hand, obey the social etiquette is good for others. On the other hand, it’s also good for yourself.
2.
Science and technology are changing our lives.
Originally, people use homing pigeons and horses to pass messages. It’s slow and not safe enough. But now, we have mobile phones and Internet! We can talk to each other directly between China and America.
In the book Journey To The West, Tang Sanzang can only walk to India. But now, we have cars, trains and planes. He reached India after he had left Chang’an. But we only need a week to reach India.
But there are also some bad news about science. Because of carbon dioxide , the average temperature of the world is rising very fast. The environmental problems are very serious these days.
Science are not only can improve our life, it also can destroy the world.
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