The Earth’s Atmosphere教案

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一、教学内容：<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

Unit 6 The Earth’s Atmosphere

二、教学目标：

知识目标：熟练掌握本单元的单词、短语、句型和语法。

能力目标：运用本单元所学的知识，描述制造、组成等方面。

三、教学重难点：

①动词的被动语态

②课文分析及理解

四、语法项目：

动词的被动语态

五、本单元的重点知识：

1. 单词：熟练掌握本单元后单词的音、形、意

2.

1) be made from          由……制造

2) be made of             由……制造

3) tiny drops of water         小水滴

4) reduce waste           减少浪费

5) 20 miles thick          20英里厚

6) protect…from                保护……免遭……

7) be made up of                由……组成

9) depend on               依靠

10) stay alive               生存

11) be used to             习惯于

12) draw worldwide attention      吸引世界注意

13) blow…away          吹走

14) be full of               充满……

15) be used for            用于做某事

句子：

1) Clouds are made of tiny drops water.  云是由小水滴构成的。

2) The atmosphere surrounds the earth like a blanket.

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3) The atmosphere protects the earth from the sun’s heat.

大气层保护地球免遭太阳的炙烤。

4) The air in the atmosphere is made up of dust and gases.

大气层中的空气是由尘土和各种气体组成。

5) More than three-fourths of gas is nitrogen.

多于四分之三的气体是氮气。

6) Plants depend on nitrogen to stay alive.    植物依靠氮气来生存。

7) More than three-fourths of the gas is nitrogen.

气体中四分之三的气体都是氮气。

8) People who travel to the mountains find it harder to breathe.

到山上旅行的人发现这里呼吸比较困难。

9) Big cities are full of cars.  大城市里都是汽车。

10) They are used for business and pleasure.   他们是用来商务和娱乐的。

11) Something should be done about the use of cars in order to have cleaner air.

六、本单元重点知识讲解：

1. The ship is made from waste materials.

The T-shirt is made of cotton.

例如：

① The book is made of paper and paper is made from wood.

② The glass is made of glass and glass is made from SiO₂.

2. The air that surrounds the earth is called the atmosphere.

包围地球的空气被称为大气。

be called  被称为

例如：

The boy is called “Da Niu” by his classmates.

That city will be called “<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />Water City”.

3. It surrounds the earth like a blanket—20 miles thick.

20 miles thick  20英里厚

数字+单位+形容词

例如：

1.7 metres tall  一米七高

6 metres wide  六米宽

20 kilometres away 20公里远

① Our classroom is three metres tall, 7 metres long and 6 metres wide.

② The Yellow River is 5000 kilometres long.

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