Welcome, everyone!Unit 11 Planting treesLesson 42The Great Green WallLook & answerHave you ever been to the Great Wall?Look & learnDo you know anything about the Great Green Wall?The Great Green Wall means a “Great Wall” of trees, millions of trees. It has been built in the Northwest. It is used for stopping the wind from blowing the earth away. It will stop the sand from moving towards the rich farmland in the south.It can prevent floods and droughts.LookLast summer, people in Hunan Province suffered from floods. Some people had to leave their houses. Look, the man is crying sadly, finding his house under the water.LookLast summer,in the city of Nanning, there were so heavy rains that people had to use a boat in the streets.And the cars had to stop by the road. LookThere are more floods in India.This Indian had to leave his house with his child. LookIt was such a drought that the rice couldn’t grow any longer.But in some places, the weather was very dry. There was a terrible drought in Sichuan Province this year. It made thousands of people live a hard life. The pond was so dry that many people had no water to drink.LookIn the Northwest, some farmland is becoming deserted( 沙漠化 ). It has brought several sandstorms ( 沙尘暴 ) to many cities.ListenTrue or false: 1) China has built another real Great Wall. 2) Forests can prevent floods and droughts. 3) A new “Great Wall” has been built with millions of trees. 4) More crops can be produced because of the Great Green Wall. 5) The Great Wall can save much land.SayTrue or false: 1) China has built another real Great Wall. ( F) 2) Forests can prevent floods and droughts. (T) 3) A new “Great Wall” has been b...
