第十课

ten10

Natural materials and artificial materials天然材料和人造材料

1．Building a house requires cement, sand and other materials.

建房子需要用到水泥、沙子等材料。

2．Sand can be obtained directly from nature, so what about cement?

沙子可以从自然界中直接获取，那么水泥呢?

Activity process活动过程

3．Where are the materials in life obtained from?生活中的材料是从哪里获取的?

4．Wood was harvested from the forest. 木材是从森林中采伐来的。

5．Cotton, wood, wool, sand and so on from nature, after simple processing can be used in natural materials;

棉花、木材、羊毛、沙子等取自大自然，经过简单加工就可以利用属于天然材料;

6．Artificial leather, glass, cement and other materials are artificial, belong to artificial materials.

人造革、玻璃、水泥等材料是人工制造的,属于人造材料。

7．What is the relationship between materials and our lives?材料与我们的生活有什么关系?

8．Reinforced concrete houses are stronger than wooden houses.钢筋混凝土房屋比木屋结实。

9．The two types of materials have their own advantages.两类材料各有优点。

10．Graphene is a new type of synthetic material.  石墨烯是一种人工合成的新型材料。

11．What are the applications of new materials?新型材料有哪些应用?

12．I know...我知道...

13．non-stick pan不粘锅

14．stealth aircraft 隐形飞机

15．winter jacket冲锋衣

Outreach activities拓展活动

16．Find out: which items in life are made of natural materials and which are made of artificial materials?

找一找:生活中的物品哪些是由天然材料制成的，哪些是由人造材料制成的?

17．Unit evaluation单元评价

18．Knowledge Park知识乐园

19．Fill in a fill, say say. 填一填，说一说。

20．material材料

21．artificial material 人造材料

22．glass玻璃

23．function性能

24．transparent透明

25．use用途

26．Windows做车窗

27．function性能

28．use用途

29．natural material 天然材料

30．sand沙子

31．The Hall of Science科学殿堂

32．Design a favorite house according to the different properties of the material.

33．根据材料的不同性能设计一间自己喜欢的房子。

34．Reflection on Space反思空间

35．My harvest我的收获

36．●Glass is a transparent material. 玻璃是一种透明材料。

37．What I want to improve on the我想改进的

38．●Experiment to study glass transparency研究玻璃透明程度的实验

39．I want to continue exploring the我想继续探究的

40．●What new materials are there?还有哪些新型材料?

Unit 4第四单元

Plant reproduction植物的繁殖

1. The flowers of plants are colorful, the fruits of plants are different, and the seeds of plants store nutrients. What is their significance to the reproduction of plants?

植物的花朵色彩鲜艳，植物的果实形态各异，植物的种子储存营养....它们对植物的繁殖有什么意义?