Module 4 Sandstorms in Asia 第一课时
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| 名称 | Module 4 Sandstorms in Asia 第一课时 |  | |
| 格式 | rar | ||
| 文件大小 | 995.6KB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 外研版 | ||
| 科目 | 英语 | ||
| 更新时间 | 2009-05-06 15:46:00 | ||
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课件27张PPT。Sandstorms in AsiaIntroduction
Look at some pictures What happens in these pictures?
There are some terrible sandstorms.
Some houses and buildings are almost buried.
That is, they are almost covered with sand.
伊拉克的沙尘暴
北京的沙尘暴
Do you know something about sandstorms?Something about sandstorms 1什么是沙尘暴 沙尘暴是沙暴和尘暴二者的总称，是指强风把地面大量沙尘卷入空中，使空气特别浑浊，水平能见度低于1千米的天气现象。其中沙暴系指大风把大量沙粒吹入近地层所形成的挟沙风暴；尘暴则是大风把大量尘埃及其它细粒物质卷入高空所形成的风暴。 Something about sandstorms 2沙尘暴的时空分布 世界有四大沙尘暴多发区，分别位于中亚、北美、中非和澳大利亚。我国的沙尘暴区属于中亚沙尘暴的一部分，主要发生在北方地区。总的特点是西北多于东北地区，平原或盆地多于山区，沙漠及边缘多于其它地区。且主要集中在两大区域：一是位于塔里木盆地的塔克拉玛干沙漠。另一个是从巴丹吉林沙漠东部，南至甘肃河西走廊，经腾格里沙漠乌兰布和至库布齐沙地和毛乌素沙地。另外在北疆克拉玛依地区、南疆的和田地区和青海的西北部地区是三个局地性沙尘暴区。 Something about sandstorms 2 在漫长的地质历史中沙尘暴显示出周期性
变化，它与地质时期气候变化和地面沙尘物质的多少有关，遇气候暖湿时期，地面植被生长茂密，生态环境条件好，沙尘暴发生频率低；反之在冷干气候时期，则沙尘暴发生频率高。 Something about sandstorms 3沙尘暴是怎样形成的 沙尘暴的形成必须具备四个条件：一是地面上的沙尘物质，它是形成沙尘暴的物质基础；二是大风，这是沙尘暴形成的动力基础，也是沙尘暴能够长距离输送的动力保证；三是不稳定的空气状态，这是重要的局地热力条件，沙尘暴多发生于午后傍晚说明了局地热力条件的重要性；四是干旱的气候环境，沙尘暴多发生于北方的春季，而且降雨后一段时间内不会发生沙尘暴是很好的证据。 Deal with activity 1
Complete the setences using
the correct form of the following words:
blow bury frighting
last sandstormAnswers：
There has been a sandstorm. It has been blowing/has lasted for ten hours and was very frightening.The wind was blowing the sand high around the houses, and some cars were almost completely buried by the sand. frightening的用法 1) frightening adj. 令人恐惧的, 引起突然惊恐的
eg:The speed of the car was frightening
He was absolutely frightening.?
他简直可怕极了。frightened的用法 2) frightened
adj.受惊的, 受恐吓的
eg: Frightened children were calling for their mothers. 受惊的孩子们呼喊著找妈妈。 I‘m frightened of the monster. 我怕妖怪。
frighten的用法3) frighten vt.使（人）害怕
eg: Sorry, I didn’t mean to frighten you.
frighten sb away
frighten sb into doing sth
frighten sb to death
fright的用法 4) fright n.(U) 惊吓
eg:He trembled(发抖)with fright.(U)
Several children cried out in fright.
(C.只用作单数)
I got an awful fright when I realised how much money I owed. Deal with activity 2
Check the meaning of these words:
dig protect sign the Pacific Ocean earthquake Explanations: 1.dig:get sth out of earth,snow using a spade(锹) or your hands
dig up:remove sth from the earth using a spade.
2.protect:keep sb/sth safe from damage/illness
protect sb/sth from(doing)sth
3.sign(C):thing that shows that sb/sth
is present or exists
a sign of sth/signs of sth
eg:Very ofen dark clouds are a sign of rain.
Scientists have found no signs of life on Mars(火星）so far.
四大洋：
the Pacific Ocean 太平洋
the Atlantic Ocean 大西洋
the Indian Ocean 印度洋
the Arctic Ocean 北冰洋Number 5 is false Explanation:cut down: 1)cause sth to fall down by cutting it at the base
eg:They cut down many trees to build a house.
2)reduce the length of sth
eg:Your article is too long,please cut it down to 1000 words. Deal with activity 3
Work in pairs.Discuss the questions:
(Answers are open)Provebs: Well begun is half done.
好的开端是成功的一半
Knowledge is power.
知识就是力量
Nothing is too difficult if you put your heart into it.
世上无难事只要肯登攀
Look at some pictures What happens in these pictures?
There are some terrible sandstorms.
Some houses and buildings are almost buried.
That is, they are almost covered with sand.
伊拉克的沙尘暴
北京的沙尘暴
Do you know something about sandstorms?Something about sandstorms 1什么是沙尘暴 沙尘暴是沙暴和尘暴二者的总称，是指强风把地面大量沙尘卷入空中，使空气特别浑浊，水平能见度低于1千米的天气现象。其中沙暴系指大风把大量沙粒吹入近地层所形成的挟沙风暴；尘暴则是大风把大量尘埃及其它细粒物质卷入高空所形成的风暴。 Something about sandstorms 2沙尘暴的时空分布 世界有四大沙尘暴多发区，分别位于中亚、北美、中非和澳大利亚。我国的沙尘暴区属于中亚沙尘暴的一部分，主要发生在北方地区。总的特点是西北多于东北地区，平原或盆地多于山区，沙漠及边缘多于其它地区。且主要集中在两大区域：一是位于塔里木盆地的塔克拉玛干沙漠。另一个是从巴丹吉林沙漠东部，南至甘肃河西走廊，经腾格里沙漠乌兰布和至库布齐沙地和毛乌素沙地。另外在北疆克拉玛依地区、南疆的和田地区和青海的西北部地区是三个局地性沙尘暴区。 Something about sandstorms 2 在漫长的地质历史中沙尘暴显示出周期性
变化，它与地质时期气候变化和地面沙尘物质的多少有关，遇气候暖湿时期，地面植被生长茂密，生态环境条件好，沙尘暴发生频率低；反之在冷干气候时期，则沙尘暴发生频率高。 Something about sandstorms 3沙尘暴是怎样形成的 沙尘暴的形成必须具备四个条件：一是地面上的沙尘物质，它是形成沙尘暴的物质基础；二是大风，这是沙尘暴形成的动力基础，也是沙尘暴能够长距离输送的动力保证；三是不稳定的空气状态，这是重要的局地热力条件，沙尘暴多发生于午后傍晚说明了局地热力条件的重要性；四是干旱的气候环境，沙尘暴多发生于北方的春季，而且降雨后一段时间内不会发生沙尘暴是很好的证据。 Deal with activity 1
Complete the setences using
the correct form of the following words:
blow bury frighting
last sandstormAnswers：
There has been a sandstorm. It has been blowing/has lasted for ten hours and was very frightening.The wind was blowing the sand high around the houses, and some cars were almost completely buried by the sand. frightening的用法 1) frightening adj. 令人恐惧的, 引起突然惊恐的
eg:The speed of the car was frightening
He was absolutely frightening.?
他简直可怕极了。frightened的用法 2) frightened
adj.受惊的, 受恐吓的
eg: Frightened children were calling for their mothers. 受惊的孩子们呼喊著找妈妈。 I‘m frightened of the monster. 我怕妖怪。
frighten的用法3) frighten vt.使（人）害怕
eg: Sorry, I didn’t mean to frighten you.
frighten sb away
frighten sb into doing sth
frighten sb to death
fright的用法 4) fright n.(U) 惊吓
eg:He trembled(发抖)with fright.(U)
Several children cried out in fright.
(C.只用作单数)
I got an awful fright when I realised how much money I owed. Deal with activity 2
Check the meaning of these words:
dig protect sign the Pacific Ocean earthquake Explanations: 1.dig:get sth out of earth,snow using a spade(锹) or your hands
dig up:remove sth from the earth using a spade.
2.protect:keep sb/sth safe from damage/illness
protect sb/sth from(doing)sth
3.sign(C):thing that shows that sb/sth
is present or exists
a sign of sth/signs of sth
eg:Very ofen dark clouds are a sign of rain.
Scientists have found no signs of life on Mars(火星）so far.
四大洋：
the Pacific Ocean 太平洋
the Atlantic Ocean 大西洋
the Indian Ocean 印度洋
the Arctic Ocean 北冰洋Number 5 is false Explanation:cut down: 1)cause sth to fall down by cutting it at the base
eg:They cut down many trees to build a house.
2)reduce the length of sth
eg:Your article is too long,please cut it down to 1000 words. Deal with activity 3
Work in pairs.Discuss the questions:
(Answers are open)Provebs: Well begun is half done.
好的开端是成功的一半
Knowledge is power.
知识就是力量
Nothing is too difficult if you put your heart into it.
世上无难事只要肯登攀