Unit2 Topic2 All these problems are very serious.SectionA课件（24张）

学习目标：1、熟记新单词，学会运用新短语；
2、学习不定代词和不定副词。
情感目标：了解沙尘暴的形成及其危害，认识树木的重要性，提高环保意识。
Review: Read the new words and review the pollution around us.
forest
Lead in
What happened to the forest ?
People have cut down too many trees. The forest has gone.
What’s worse, the forest has changed into desert.
n. 沙漠 v. 舍弃、遗弃
The wind is blowing strongly with lots of sand,
we call it sandstorm.
n. 沙
n. 沙尘暴
Wash the earth away
many trees
change into desert
forest gone
sandstorms come into being
cut down trees
( 4 )
( 1 )
( 5 )
( 3 )
( 6 )
( 2 )
思考：How does the sandstorm come into being?
形成、产生
Self –study：（小组讨论，完成自主学习）
1、Change the word into correct forms.
2、 Read the dialog, underline the phrases and translate them.
1、The boy and girls are talking about _____
B
2、【词形变换】
变为名词：pollute _________
变反义词：outside _________
变同义词：prevent _________；
though __________；
rubbish _________
pollution
inside
stop
although
litter
展示：Show me your answers.
3、短语翻译
1. 刚才_________
2. 不能看见任何东西 ____________
3. 砍伐太多的树木_______________
4. 结果 ______
5.大量富饶的土地_______________
6.变成__________________
7 .阻止大风刮走泥土____________________________
8. 阻止流水冲走泥土____________________________
9. 对……有害__________________________
10.人类 _____________________
just now
can’t see anything
cut down too many trees
be harmful to
stop the wind from blowing the earth away
change… into…
as a result
just now
stop the water from washing the earth away
human being
Trees can stop the wind from blowing the earth away.
Trees can also stop the water from washing the earth away.

Read 1a and complete trees’ functions
B、A lot of water can be saved by forests
A、Trees can stop the wind from blowing the earth away.
C、Trees can also stop the water from washing
the earth away.
Group–work：（小组讨论，分析以下句子，并总结短语的用法）
展示学生成果：（叫同学讲解并用投影仪展示讨论结果）
2、As a result, a lot of rich land has changed into desert.
结果，许多肥沃的土地已经变成了沙漠。
点拨：a) change… into…（把…变成…）
= turn… into… 把…..(转)变成…..
e. g：Please change English into Chinese. 请把英语变成汉语。
练习：我们可以把冰变成水。We can _______ ice _____ water.
1、What bad weather!
点拨：What引导的感叹句--- a. What+形容词+不可数名词/可数名词复数！ （不可数名词如:news; advice; weather; water） b. What+ a/an+形容词+可数名词单数！
练习：1）多么繁忙的一天呀！________________
2) 多么清澈的水呀！________________
重点讲评
What a busy day!
What clean water!
change
water
3、Trees can stop the wind from blowing the earth away.树可以防止大风刮走泥土。
Trees can also stop the water from washing the earth away. 也可防止流水冲走泥土
点拨：stop sb./sth. (from) doing sth.
= prevent sb./sth. (from) doing sth. --- 阻止…做某事
链接：同义词组
keep sb./sth. from doing sth. --- 阻止…做某事（from不能省略）
练习：大雨使我们无法外出。
The heavy rain us going out..
=________________________________
=_________________________________
stops
The heavy rain prevents us form going out.
The heavy rain keeps us form going out
form
4、Cutting down trees is harmful to human beings, animals and plants.
译：_______________________________
思考：cutting down trees是_________短语在句子中作______语，谓语用______数。
练习：阅读是我的爱好。 my hobby.
5、不定代词和不定副词
(一) 不定代词：指人：someone/ somebody anyone/ anybody no one/ nobody everyone/everybody
指/：something anything nothing everything
（二）不定副词：somewhere anywhere nowhere ever
动词
单
主
Reading
is
砍伐树木对人类、动物和植物有害。
( )1.We should humans destroying the environment.
A. keep . by B. stop. to C. prevent. by D. stop. from
( )2.I have to wait for the traffic lights to green .Then I can go on walking.
A. change B. changed C. change to D. changing into
( )3.The heavy rain us from finishing the work.
A .protected. B. prevented C. moved D. made
( )4. The driver was badly hurt _____ of the traffic accident.
A. at a result B. in the result C. with the result D .as a result
( )5. always helps others _____ she is very busy.
A. but B. and C. although D. because
( )6. We must plant more trees after we _____ every year.
A. cut off them B. cut them off
C. cut down them D.cut them down
自我检测
Answers:1、C 2、D 3、D 4、D 5、B 6、D 7、C 8、D