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(Teacher goes among the class and join in the students' discussion. Some minutes later, teacher says the following. ) T: Have you finished? Ss: Yes. T: Let's do Ex. 1. Who will talk about the first picture? S: Perhaps the first picture is a geomorphologic map. T: Please go on ! SB: In the second picture we can see a scene in which some tall trees are blown down. Perhaps a typhoon has just happened. What a sad scene! If we want to get more information, we can see pictures taken by the satellite on the Internet. Sc: In the third picture. I saw a comet. It has a very bright head and a long less bright tail and is moving through the sky to the ground. If we want to see it more clearly, we can see it through a telescope. T: How do you know when it will happen? SD: The TV programme will tell us in advance. It will tell us its detailed timetable and the other information about it. SE: In the last picture we can see a cell, but it is enlarged many times. We often see cells in our biology classes. As long as you have a microscope, you can see them clearly. T: Do you often hear about these things in newspapers or on TV? SF: Both. In summer we often hear about typhoons on the Pacific. There are about seven typhoons in the southeast of our country. If there are fewer, drought will take place. SG: Some years ago, we learned from the newspaper and TV that a comet would pass through the dark sky in our country. Our geography teacher organized us to watch it through a microscope. T: Now answer the third question, please. How does nature form a danger to people in the world and how can science help reduce that threat? SH: Typhoons are harmful to us. They can pull up the tall tree, blow down the wire poles and even destroy people's houses. Sometimes it can cause severe flood. SI: Earthquake can bring great damage to people's life. It can cut off electricity and water supply and destroy houses. Even it often causes deaths. In 1976 a terrible earthquake in Tang Shan killed thousands of people. SJ: If the typhoon and earthquake can be forecast, damages will greatly be reduced. Scientists in our country can forecast typhoons exactly and some of the earthquakes have been forecast before. I’m sure they will control the natural disaster and reduce the losses to the lowest degree. (责任编辑：admin) |