老师：Hello everyone, I'm Miss Lin from Jiadao Middle School in Fangshan District. Welcome to this lesson. We will continue to learn Unit 6 Earth. First, the third period of this unit, we will mainly focus on environmental problems to be solved listening and speaking. First of all, the learning goals. First, to select the topics the lecture covers after listening. Second, to note down the causes, effect and control measures in the past at present by listening again. Third, to talk about another environmental problem in a similar conversation. Are you ready? Here we go. In the previous sessions, we have talked about some environmental problems and we have come up with some possible solutions to these problems. Let's review them.
老师：First, in the previous lessons, we talked about the endangered animals, the shark. We know that we can protect the forest and the oceans to prevent the animals from being endangered. We can also make public speeches to educate people and raise their awareness. Besides, we can build up nature reserves to protect the endangered animals.
老师：Today, we are going to face a new topic, environmental problems to be solved. First, please look at the two pictures and list out some environmental problems to be soft. Yes, there are many environmental problems in our daily life, such as water pollution, greenhouse effect, global warming, climate change, air pollution and so on.
老师：As for air pollution, do you know the word smog? Now 10 to page 67. Read did you know? And get some basic information about smog. Let's read did you know together. Smog comes from the words smoke and fog, and it is used to describe the air pollution in cities caused many by traffic and factories. Smug can be dangerous because it causes severe breathing problems and infections.
老师：After reading the short passage, let's try to answer some questions. No. 1, where does the word smug come from? Smoke comes from the word smoke and fog. Number two, what is it used to describe? It is used to describe the air pollution in cities caused mainly by traffic and factories. No. 3, why is it dangerous? Smog can be dangerous because it causes severe, brazen problems and infections. That means smoke is harmful to our health. I'm sure you want to know more about smug. Now let's watch a video to get to know more information related to smart.
学生：On July 26th1943, Los Angeles was blanketed by a thick gas that stung people's eyes and blocked out the sun. Panicked residents believed their city had been attacked using chemical warfare. But the cloud wasn't an act of war. It was smog, a portmanteau of smoke and fog.
学生：The word smog was coined at the beginning of the 20th century to describe the thick, gray haze that covered cities such as London, Glasgow and Edinburgh. This
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