Unit+2+Topic+3+Section+C 仁爱版九年级英语上册.pptx

Unit 2Saving the Earth Topic 3 Section C 学学习习导导航航新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨学习目标学习目标1.能熟悉并正确运用本课时的重点单词和短语2.能通过阅读文章，了解现代科学技术在环境 保护方面的作用新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨dis(no)+advantage=disadvantage(n)Its an electric car.It works well,but its disadvantage is that it slow and cant run for long.Look at the following pictures and guess the meaningof the underlined word.缺点新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨 Its a maglev train.It has no wheels but it runs very fast.It can run more than four hundred km per hour.磁悬浮列车磁悬浮列车新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨n.技术China is one of the first countries in the world to use biogas technology.沼气Its an electric car.It works well,but its slow and cant run for long.electric(adj.)electricity(n.)新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨电动的新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨1aRead and understand.In many countries,people produce power from coal,but it is very dirty and causes acid rain.Some countries use nuclear energy to produce power.However,nuclear power can be very dangerous.To solve the energy problem,people all over the world are looking for new ways to produce power.China is one of the first countries in the world to use biogas technology.Farmers recycle straw,grass and animal waste to make biogas.This renewable energy is used in peoples everyday lives.Its key disadvantage is that the process requires a long time(up to 30 days)and the cost is high.新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨 Electric vehicles were developed in the 1990s.On April 11,2010,a new kind of electric vehicle named“Yezi”was shown in the 2010 Shanghai World Expo.It produces electricity from the sun,the wind and CO2.It can not only protect the environment but also save energy.Its too small to hold many people,but larger models will be developed in the near future.In China,the best-known maglev train is the German-built one in Shanghai.It takes people just 7 minutes to go to the airport 30 km away.The train can reach a top speed of 431 km per hour.It is quiet and quick.There is no wheel noise,because there are no wheels.Maglev trains are very energy-efficient and do not pollute the air.However,maglev guide paths are much more expensive than traditional steel railways.新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨Look at the pictures.Do you know what they are?Choose the right picture for each paragraph.paragraph 2 paragraph 3 Paragraph 4新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨1bRead 1a and match the words with the pictures on Page 48.A.acid rain B.nuclear energy C.biogas ACB()()()新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨1cRead 1a again and complete the table.ItemAdvantageDisadvantagebiogas electric vehicle maglev train renewablelong process and high cost for its building save energy,no pollutiontoo small to hold many people quiet,quick,energy-efficient,no pollution much more expensive than traditional steel railways 新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨2aRead the passage below and match the pictures with the sentences.Then discuss in detail the use of one energy source.The sun,wind,waves and heat from deep in the earth are energy sources.They will never run out so they are called renewable sources.In 2011,about 16%of energy used worldwide came from renewable sources.The use of it is increasing rapidly each year.新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨1.Wind can produce electricity in many places.2.People use sunlight to produce electricity.3.Sea waves are used for producing electricity.4.People use hot water or steam from deep in the earth to produce electricity and heat for factories,schools and homes.新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨2bTake notes on your discussion and write a passage with them.You may begin like this:Sunlight can produce a lot of energy.People began to use the energy from the sunlight in different ways many years ago新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨 Sunlight can produce a lot of energy.People began to use the energy from the sunlight in different ways many years ago.We can use it to warm the house in the winter,to heat the water for baths,and to produce electricity.Whats more,we can even use it to run vehicles directly in the near future.As is known to us,the energy from the sunlight has a lot of advantages.For example,it is clean,renewable and non-polluting.Besides,it does no harm to our nature.So wed better use it as much as possible.You can write it like this:新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨Key points1.Some countries use nuclear energy to produce power.use sth.to do sth./use sth.for doing.使用某物来做某事eg:People used bamboo to write with in the past.在过去人们使用竹子写字。

People use wind for producing electricity.人们用风发电新知学习新知学习课堂小结课堂小结当堂检测当堂检测学习目标学习目标重点研讨重点研讨2.Its key disadvantage is that the process requires a long time(up to 30 days)and the cost is high.它最大的缺陷是生产过程需要很长时间（长达30天）和成本高process n.步骤，过程 v.加工，处理require v.需要，需求require 有两种用法：*require(doing)sth.表示主语“该了”eg:The floor requires washing.地板该洗了be required t。