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课堂10分钟达标A dam is a man-made structure built across a river. Most dams are built to control a river’s water flow, improve navigation and control flooding. However, some dams are built to produce hydro-electric power.Hydro-electric power is produced as water passes through a dam, and into a river below. The more water that passes through a dam, the more energy is produced. Once a dam is built, a man-made lake is created behind the dam.Electricity is produced by a kind of equipment called a turbine(涡轮机). Turbines contain metal coils(线圈)surrounded by magnets(磁铁). When the magnets move round rapidly over the metal coils, electricity is produced. Turbines are located inside dams. The falling water makes the magnets go around the coils.Dams provide clean energy, but they can also harm the environment. Species that use rivers to reproduce are often hurt by dams. In the northwest of the US, the population of fishes has dropped from16million to2. 5million since hydro-electric plants were built on the Columbia River. Dams all over the world have hurt some species.The highest dam in the United States is located near Oroville, California.The Oroville Dam towers230metres and is more than a mile wide. This dam was built in1968, 22years after the Hoover Dam. The Hoover Dam, on the Nevada-Arizona border controls the Colorado River. It is221metres high and has2. 6million hectare-metres of water.The highest dam in the world is the Nurek Dam on the Vakhsh River in Tajikistan, a country in central Asia. This dam is300metres tall.【语篇概述】本文为说明文, 主要介绍大坝的定义、作用、利弊和水力发电的原理, 以及美国及世界上最高的大坝等知识。
Module3 Listening and Vocabulary; Grammar1精品教案Teaching aims:1. To introduce the interpersonal relationships between persons and how to improve friendship.2. To know the forms of having done and v-ing and v-ed and learn how to use them.3. According to learning the materials, make the Ss form active friendship with others. Important and difficult points:1. Get students to know how to deal with the interpersonal relationships and form good friendship.2. Make the Ss know how to use the form of having done and make sure its real meaning.3. Help students to know how to set up healthy and positive in western countries.Step1.Ask all the Ss to do it and then ask three or four Ss to answer the question.Do you think good friends should never quarrel? Why or why not？Step 2. Let the Ss to read the words in the box after the teacher.Ask the Ss to read the short passage and explain the words hurt, personality, quarrel according to the context. If the Ss have difficulty in doing this the teacher can give them a hand.The teacher asks the Ss questions and let the Ss answer them as quickly as possible. Listen to the tape and ask the Ss to write down the information using key words. Then ask some Ss to say some sentences about the topic.Listen to the tape again and ask the Ss to correct their answers if necessary the teacher can let the Ss listen to the tape for the third time.Step 3. Ask the Ss to read the sentences in the book and the teacher can add the following sentences.1.Walking through the street, he caught sight of a tailor’s shop.2.Playing football on the ground, he hurt his leg.The teacher tells the Ss about having done using the designed questions in the book and the added examples.1.The form of having done means the action happens before the main action, but the form of doing means the action and the main action happens at the same time.2.The form of having done has the same subject as the form of doing.3.The forms of having done and doing all express initiative to the subject.Step 4. Ask the Ss to finish the exercises in Activity2, but the teacher must let the Ss compare the form of having done with the form of doing.For exampleActivity2I felt shy and lonely at my school because I had lost all my old friends.Having lost…I enjoyed my stay in London better than my friend because I know English. Knowing English…Activity4After I had been to his house a few times, I started to get to know his family. Having been to…When he heard the news, he let out a cry of surprise.Hearing the news…The teacher can add the following exercises to strengthen the Ss’ understanding about the form of having done and the form of doing.1.The dog jumped and ran forward, _______ (follow) his master.2.______ （carry）out the task ahead of time, he was praised by his boss.3.The students were in high spirits, ______ (sing) all the day.4.______ (live) there for a long time, he is used to the food there.5.______ (hurry)into the room, he noticed something unusual.6.______(walk)home along the street, he came across an old friend.7.______ (not receive)an answer, he wrote to him again.。
