第四单元 Unit 4 1.生活中的材料 Materials in life 2.课桌是木头做的 The desk is made of wood 3.餐具是陶瓷做的， The tableware is made of ceramics, 4.纸的用途多又多。 Paper has many uses. 5.什么是玻璃做的？ What is made of glass? 6.什么是塑料做的？ What is made of plastic? 7.金属可以做什么？ What can metal do? …… 8.生活中离不开各种材料，让我们一起走进材料世界。 Life is inseparable from a variety of materials, let's go into the world of materials. 第十四课 Lesson fourteen 木材 wood 1.木材的应用非常广泛，我们准备不同的木材，放大镜、酒精灯、导线、电池、小刀、锤子等来研究。 Wood is widely used. We prepare different kinds of wood, such as magnifying glass, alcohol lamp, wire, battery, knife, hammer, etc. 2.木材有什么特点？ What are the characteristics of wood? 3.我想用三种方法来研究。 I want to study it in three ways. 4.比一比看谁的方法多，谁的发现多。 There are more ways to see and more discoveries. 5.木材是天然材料，在生活中具有很重要的作用，我们要珍惜木材。 Wood is a natural material and plays an important role in our life. We should cherish wood. 6.人们是怎样利用木材的？ How do people use wood? 7.用什么材料可以代替木材？ What material can replace wood? 8.天然材料：如棉花、木材、竹子、煤、石油等非人工合成的材料。 Natural materials: such as cotton, wood, bamboo, coal, oil and other non synthetic materials. 9.人造材料：如塑料、人造革、人造纤维等人工合成的材料。 Man made materials: such as plastics, artificial leather, man-made fibers and other synthetic materials. 10.我们来开辩论会。 Let's have a debate. 11.一次性木筷有好处。因为…… Disposable chopsticks are good. Because 12.我不同意。因为…… I disagree. Because…… 13.我们…… We…… 14.调查：一天中，一个中等规模的饭店共用掉多少双一次性木筷？照这样计算，一年会用掉多少木材？ Survey: how many pairs of disposable chopsticks do a medium-sized hotel share in a day? According to this calculation, how much wood will be used in a year? |
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