《Sandstorms in Asia》ppt27（14份）
Module 4 Sandstorms in Asia Section Ⅰ Introduction & Reading Pre-reading
In April 2012, a dust storm that originated in China and Mongolia took a six-day journey across more than ten thousand kilometers of sea and open land to Arizona in the United States. The cloud was so dense that it seemed as if the sun were setting early. At least one person thought a volcano had erupted.
Although traveling dust storms are nothing new, the dust now often contains chemical or metallic substances that contribute to respiratory illnesses (呼吸道疾病) and damage the environment. At present, a group of researchers in Asia is studying aerosol particles and their effects on the environment — and they have plenty of dust to work with.
Dust storms are one of the repercussions (后果) of humans messing around with Mother Nature. Although they are a natural phenomenon, dust storms have been occurring more often, at shorter intervals, and with greater force in recent years, and human activity is the cause.
It is a fact that excessive herding of animals and exploitation of grasslands are responsible for the majority of dust storms. This means that dust storms are largely a result of human actions; in other words, they are controllable.
Section_Ⅰ Introduction & Reading — Pre-reading
Sandstorms① in Asia
Sandstorms have been a major② disaster for many Asian countries for centuries. Scientists have tried many ways to solve this problem and in China, a mass③campaign④ has been started to help solve it.
Sandstorms are strong, dry winds that carry sand⑤ .They are often so thick that you cannot see the sun⑥， and the wind is sometimes strong enough to move sand dunes⑦. The four main places in the world where there are sandstorms⑧ are Central Asia, North America, Central Africa and Australia. Ren Jianbo, from Inner Mongolia described a terrible sandstorm he experienced⑨ as a child in the desert. “To have been caught in a sandstorm⑩ was a terrible experience，” he said.“There was nothing to be done⑪. It was the most frightening and the most dangerous situation I’ve ever been in⑫. You just had to hope you’d survive. I thought I was going to disappear under the sand.”
Module 4 Sandstorms in Asia Section Ⅱ Introduction & Reading Language Points
1.frighteningadj.吓人的；可怕的→frightened adj.害怕的→frighten vt.使害怕→fright n．害怕
4.strengthn．力量；力气→strengthen vt.加强→strong adj.强壮的
5.cyclevi.骑自行车→bicycle n．自行车→cyclist n．骑自行车的人 1. sandstorm n．沙尘暴
⑤volcanic eruption 火山喷发
2. forecast vt.预报；预告
[记法] fore- (前面，预先) ＋ cast (投；发射) →预报
①foretell v. 预言
②foresee v. 预见
③forehead n. 前额
3. frightening adj.吓人的；可怕的
8.one_after_another 一个接一个地 1.a major disaster 一个主要灾难
2.solve this problem 解决这个问题
3.a mass campaign 一场大规模的运动
4.strong enough 足够强
5.as a child 作为一个孩子，小时候
6.the most frightening and the most dangerous situation
7.because of climate changes 因为气候变化
8.to prevent it coming nearer 为阻止它逼近
先背熟 再悟通 后仿用
1.They are often so thick that you cannot see the sun, and the wind is sometimes strong enough to move sand dunes.
沙尘暴常常很浓密，以至于遮住了太阳，有时风力大的足以移动沙丘。 “so ＋ adj./ adv. ＋ that ...”表示“如此……以至于……”。 My clock rings so_loudly_that it will certainly wap.
Module 4 Sandstorms in Asia Section Ⅲ Grammar 动词不定式和but＋不定式
①Experts hope to learn more about the movement of thunderstorms.
②There was nothing to be done.
③The storms sometimes continue all day and traffic moves very slowly because the thicst makes it difficult to see.
④When a sandstorm arrives in the city, weather experts advise people not to go out.
⑤It is difficult to breathe and the dust makes me ill.
⑥To prevent it coming nearer, the government is planting trees.
⑦My job is to teach.
⑧I can do nothing but wait at home.
⑨She has no choice but to give in.
时态 主动 被动
一般式 to do to be done
进行式 to be doing /
完成式 to have done to have been done
I hope to see you next week.
I’d like to be told what’s going on.
I happened to be watching TV when she called.