老师：Hello everyone, welcome to my class. Today we are going to learn Unit 2, topic one, pollution has caused too many problems, section A. Hopefully after today's lesson you will be able to first use the new words and expressions to describe the environment. Second, use the simple past tense and the present perfect tense properly to make comparison. Third, be aware of the importance of environmental Protection. Let's get started.
老师：Last year an unusual friend came to Zhangzhou for a visit. Do you know who he is? He's an Oriental stock or Dongfang Bai guan. In Chinese. Let's just call him Orion for short. As the national first class animal, this kind of bird is very rare. Every year he flies to the south for winter. Let's follow Orian's footprint to see what has happened around us.
老师：让我们追寻东方白冠的足迹，来看看我们的周围都发生了什么。
老师：Some years ago, when he flew over the sky of Zhang Zhou, he wouldn't stay because it was a mass. And we can also say several years ago, several. But now what has happened? Oh my goodness, everything has changed. Goodness.
老师：After leaving Zhang Zhou, Oreo left for a place called the West Hill. Here are two pictures of the West Hill. Can you say something about the pictures? For example, there are some factories, there's a dirty river. There is waste water from those factories, waste. However, on the other picture, the river is clean. We can also see some bees and butterflies.
老师：Butterfly attention. Butterflies is the plural form of butterfly. Actually, one of the picture is about the West Hill in the past. The other is the West Hill now. Please listen and Mark words with P for past and end for now, Hong Kong.
学生：Jane, Maria and Michael are planning a picnic for Sunday.
学生：Hong Kong, where shall we go?
学生：What about the West Hill?
学生：I went there two years ago. It was a mess. There were several chemical factories pouring wastewater into the stream. What's a shame?
学生：I have heard it has become a beautiful place. There are lots of flowers and grass.
学生：Sounds great. Let's go there.
学生：On Sunday, they come to the West Hill.
学生：Oh, what a beautiful place. The air is fresh and the water is clean and you can see bees and butterflies dancing.
学生：Everything has changed.
学生：Do you want to have a picnic here? Of course.
老师：It's time to check the answers. We should only Mark P for factory and wastewater and Mark N for the rest. Now let's listen again and try to complete the table. Here's a tip for you to predict the information before listening is always helpful.
老师：请同学们按下暂停键，预测空白处的信息。
学生：Hong Kong. Jane, Maria and Michael are planning a picnic for Sunday.
学生：Hong Kong, where shall we go?
学生：What about the West Hill?
学生：I went there two years ago. It was a mess. There were several chemical factories pouri
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