老师：Hello everyone. How are you feeling today? I hope you are all feeling well, but I had a headache this morning because many people are working for a tall building near my house. They work day at night and I can't sleep well at night. Do you have the same experience? Noise is really a kind of pollution and is harmful to human's health. Do you know what things can make noises?
老师：Yes, we have the same opinion. Buses, cars, airplanes, machines, cats. At the south of piano, rain and wind can make noises. Here is a passage about the noise pollution. When we read it, we'll meet some new words. Produce, staff, print, harm, sort. Let's infer their meanings when reading.
学生：In today's world, almost everyone knows air pollution is harmful to people's health. However, not all people know noise is also a kind of pollution and is harmful to human's health. People who work and live in noisy conditions often go death. For example, many of the workers who print newspapers and books lose their hearing. Quite a few people living near airports also have hearing loss. Recently it was reported that many teenagers in America can hear no better than 65 year old people. People do, because these young people always listen to loud pop music.
学生：Making a loud noise in public is also a kind of pollution. It not only disturbs others, but also does great harm to people's hearing. Cars and machines also produce too much noise. Such pollution makes people feel uncomfortable, and unpleasant, and it can even cause them to become sick or death. Nowadays, many countries are trying to solve all sorts of environmental problems, including noise pollution.
老师：当我们在阅读中遇到新单词时，我们可以通过上下文的语境推测出它们的大意。如在 people who work and live in noisy conditions often go deaf 句中，根据句意，工作和生活在嘈杂环境中的人们经常会变得可推之。 deaf 一词的词义为，听力差的、聋的。请同学们来试着根据语境推测出其他几个词的意思。
老师：excellent，我们可以根据 cars at the machines also produce too much noise 的句意，小汽车和机器也什么什么太多的噪音可推测出 produce 意为生产制造。根据 many of the workers who create newspapers and books lose their hearing 一句的句意，许多什么什么报纸和书刊的人丧失了他们的听力，推测出 print 的词义为印刷。根据 it not only disturbs others， but also does great harm to peoples hearing 的句意。它不仅打扰别人，而且什么什么别人的。听力推测出 harm 意为伤害。 too harm to 伤害损伤。根据 nowadays many countries are trying to solve all sorts of environmental problems。
老师：一句的句意。现在许多国家正在努力解决什么什么的环境问题，可知 salt 译为种类 or thoughts of。各种各样的。掌握了根据上下文推测生词含义的技巧，对同学们正确理解句子和短文会有很大的帮助。扫清了单词的障碍后，同学们就可以轻松地找到主题句，进而更好地理解短文的内容了。
老师：Let's read passage again, underlie the topic sentence of the passage.
学生：In today's world, almost everyone knows air pollution is harmful to people's health. However, not all people know noise is also a kind of pollution and is harmful to humans health. People who work and live in noisy conditions often go deaf. For example, many of the workers who print newspapers
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