资源简介

(共12张PPT)
Unit 4
The Wonders of Nature
The Sahara Desert
Look at the two pictures. What are they
Have you ever dreamed of visiting such places
Sahara Desert
Rainforest
The Sahara Desert
Located in Africa, the Sahara Desert spreads across 30 per cent of the continent. This vast desert, also known as “the great desert” in Arabic, is about 9 million square kilometres in size. It is also at least 4.6 million years old. This means that it is one of the oldest places in the world.
All deserts are dry, and the Sahara is both dry and hot. It is the largest hot desert in the world. We may think that all deserts are hot, but in fact some deserts are very cold! Many scientists believe that Antarctica,
for example, is a type of cold desert.
1
2
位于；坐落于
遍布；横跨
30%
也被称为
在尺寸/面积上
至少
460万年
2. 所有的沙漠都很干燥，而撒哈拉沙漠既干燥又炎热。它是世界上最大的热沙漠。我们可能会以为所有沙漠都很热，但事实上有些沙漠非常寒冷！
例如，许多科学家认为南极洲就是一种冷沙漠。
事实上；实际上
Most of the Sahara is rocky ground. But there are also places with grass, lakes, mountains, and even sand seas. A sand sea is just what it sounds like—it looks like a sea of sand! When the wind blows, the sand looks like waves.
Life in the Sahara is difficult. About two million people live in the Sahara. They usually move from place to place. There is water in a few parts of the Sahara, and some people live in these places all year round.
Not many animals can live in a place with such a dry and hot climate. They must adapt to survive.
3
4
5
岩石地貌
沙海
顾名思义
从一个地方搬到另一个地方
全年
adapt to 适应……
为了生存而适应（环境)
看起来像波浪
Camels, for example, go for a long time without drinking water. When they do find water, they can drink more than 100 litres of it in 13 minutes! Fennec foxes live in the desert too. They have large ears to help their bodies stay cool.
Today, the world’s largest hot desert is getting even bigger. It is now about 10 per cent larger than what it was about a century ago. But why is it growing Some scientists believe that part of the reason is climate change. As temperatures rise, summers in Africa grow hotter and less rain falls. Water bodies get smaller and the ground gets drier and drier. If we do not take effective measures, the desert will keep growing!
5
6
/fenek/耳廓狐
比大约一个世纪前扩大了10%
气候变化
降雨量减少
变得越来越干燥
采取有效的措施
公众号:懒人笔记资料库
13540016960
What kind of passage is it
A.Exposition(说明文)
B.Narration(记叙文）
What’s the structure of this passage
A. ①/ ②③④⑤/⑥
B. ①②/ ③④/ ⑤⑥
C. ①/②③/④⑤/⑥
Complete the mind map of the Sahara Desert.
Sahara Desert
Location
Growth
Life
Size
Age
Geography
in Africa
about 9 million square kilometers
about 10% larger than a century ago,
at least 4.6 million years old
about 2 million people, camels, fennec foxes
rocky ground, grass, lakes, mountains, sand seas
Discuss the questions.
1. How is life in the desert different from other places
Life in the desert is very different from other places because there is not much water, and it is very hot.
2. Would you like to visit/live in the Sahara Why
I would like to visit the Sahara Desert, but not to live there.
3. What will happen if the Sahara keeps growing What can we do to stop it
If the Sahara keeps getting bigger, we will lose more land for homes and farming. We must try and stop the climate from getting too hot and dry to help stop this process.
1. Sahara /s hɑ r / n. 撒哈拉沙漠
2. desert / dez t/ n. 沙漠（注意区别动词 /d z t/ 抛弃）
3. locate /l ke t/ v. 位于；坐落于
4. spread /spred/ v. 延伸；扩散
5. continent / k nt n nt/ n. 大陆；大洲
6. vast /vɑ st/ adj. 广阔的；巨大的
7. Arabic / r b k/ n. 阿拉伯语；adj. 阿拉伯的
8. square /skwe / adj. 平方的；正方形的
9. kilometre /k l m t / n. 千米；公里
10. million / m lj n/ num. 百万
11. largest / lɑ d st/ adj. 最大的（large的最高级）
12. fact /f kt/ n. 事实；in fact 实际上
13. scientist / sa nt st/ n. 科学家
14. Antarctica / n tɑ kt k / n. 南极洲
15. rocky / r ki/ adj. 多岩石的
16. ground /ɡra nd/ n. 地面；土地
New words
17. mountain / ma nt n/ n. 山；山脉
18. wave /we v/ n. 波浪；海浪
19. blow /bl / v. 吹；刮风
20. difficult / d f k lt/ adj. 困难的；艰难的
21. animal / n ml/ n. 动物
22. climate / kla m t/ n. 气候
23. adapt / d pt/ v. 适应
24. survive /s va v/ v. 生存；存活
25. camel / k ml/ n. 骆驼
26. example / ɡ zɑ mpl/ n.
例子；for example 例如
27. litre / li t / n. 升（容量单位）
28. fennec fox / fen k f ks/ n. 耳廓狐
29. effective / fekt v/ adj. 有效的
30. measure / me / n. 措施；v. 测量
31. process / pr ses/ n. 过程；进程
New words

展开更多......

收起↑