Book III Module 6 Old and New课前学习目标：1.To get to know some expressions related to hydro-electric dam2. To get familiar with the words on page 51 to page 53, and try to grasp some words if possible3. To solve some difficulties by consulting dictionaries, surfing the Internet and so on4. To learn more about the Three Gorges Dam and other man-made structures to enrich horizon 学法指导：自主、探究式一、 热身导航：1.预习课本P51的内容并完成课本相关的练习。2. 通过略读和详读相结合，了解P53文章的主要大意，并能完成课后相关的练习。二、 预习成果小验收：1.Could you fill in the blanks by using the words in activity 2 and 3 on page51?1).A _ is a barrier（障碍物）that is built across a river in order to stop water from flowing , used especially to make a lake for storing water to produce electricity.2). Hydro-electric means using the power to produce electricity. The Three Gorges Dam is the largest _dam in the world.3).The Great Wall of China is the longest man-made _（建筑物）ever built, most of which _/_（追溯到）the Ming Dynasty. There is an attractive story about the _ （起源，开端）of the Great Wall of China , according to which the _ （原始的，最初的）wall was 6300 kilometres long. No one can tell for sure when the building of the Great Wall was started, but it is popularly believed that it originated as a military fortification(要塞). It was not until the Qin Dynasty that the separate walls were connected to form a defensive system by Emperor Qin Shi Huang. Do you know what the Great Wall _（追溯到）the Qin Dynasty looked like ? 4).Hong Kong International Airport was the biggest civil _（土木工程）project of all time ,whose _（候机厅）building is the largest covered space in the world.5). You have a good memory! Try to memorize the following sentence and put it into Chinese.The airport is within five hours flying time of half the worlds population and is designed to accommodate 80 million passengers a year._.be designed to do打算用来做 be designed for sb (某物)是为某人准备的这本书是为中学生准备的_.这个音乐大厅被设计成能容纳20000人。_ .Consolidation:1).内战 _ 民权_2). 追溯到 常用现在时，无被动 _/_ 这座教堂始建于14 世纪 _.3). of all time _ all the time_at one time_ at a time _4)提供某人某物_.2. Do you know why people constructed the Three Gorges Dam and how it generates electricity? If you read the following article, you will be knowledgeable.三、热身加油站 A dam is a man-made structure built across a river. Most dams are built to control a rivers water flow, improve navigation and control flooding. However, some dams_.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(水轮机). 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 from 16 million to 2.5 million since hydro-electric plants were built on the Columbia River. Dams all over the world have hurt some species. The highest dam in the Unites States is located near Oroville, California. The Oroville Dam towers 230 meters and is more than a mile wide. This dam was built in 1968, 22 years after the Hoover Dam. The Hoover Dam, on the Nevada-Arizona border controls the Colorado river. It is 221 meters high and has 2.6 million hectare-meters of water.The highest dam in the world is the Nurek Dam on the Vakhsh River in Tadzikistan, a country in central Asia. This dam is 300 meters tall. Q1: Fill in the blank.( within 6 words)_Q2: Translate the underlined sentence into Chinese._Q3: The third paragraph mainly tells us :(within 10 words) _Q4: What damage do dams cause to environment according to the article ?(within 12 words)_