Unit 7 Know Our World Lesson 38 The World Is a Big Place 教学课件

课件24张PPT。Lesson 38: The World Is a Big PlaceLead-in (7:50-7:54)planet ['pl?nit]n.行星
billion['bilj?n] n. 十亿；千兆
total ['t?utl] n. 总计;总数
adj. 总计的;总的
increase [in'kri:s]v.增加，增大
surface ['s?:fis]n.表面
Indian['?nd??n] adj. 印度的；n. 印度人
Atlantic[?t'l?ntik]n.＆adj.北极的
Arctic ['ɑ:ktik]adj.北极的
Thinking（7:54-8:09) (10:14-10:29)Task 1: ★ P100 Read the passage aloud and underline the words you can’t read.
Task 2: ★ P100 Listen to the passage and check the pronunciation of the words and underline the phrases
Task 3: ★ P101 Let's Do It ! ???

Task4:Translation between English and Chinese
Discussion(8:09-8:18)(10:29-10:38) 1.Check your answers with your classmates.
2.Read the text.
Show time(8:18-8:27)(10:38-10:47)in total_____________ on the earth____________
one third____________ a lot of =lots of_______
be covered with_________ all year round _________
the largest one___________ in the future___________
总共，总计在地球上三分之一很多被...覆盖一年到头最大的一个在将来planet ['pl?nit]Arctic ['ɑ:ktik]
Atlantic
[?t'l?ntik]surface ['s?:fis] increase [in'kri:s, 'inkri:s] Show time(8:18-8:27)(10:38-10:47)increase dry surface billion total
1.The number of swimmers here is____________quickly because it's very hot these days.
2.The school has a _______of 900 students.
3.I think t may be the_________season of the year.
4.The _______ of our body ia skin.It protect us.
5.How many ______of people are there in the world now.increasingtotaldriestsurfacebillionsExplanation (8:27-8:36)1.total['t?utl]n.总计，总数adj.总的；总计的
考向一：total做名词时，构成a total of,修饰可是名词复数时，其谓语动词多用复数形式，the total of...后的谓语动词一般用单数形式。
eg:___ _____ __twenty letters were recieved last month.上个月共收到20封信。
考向二：total 做形容词时，意为：“总的，总计的”一般在句子中作定语，不作表语。
eg:You can choose four out of the_____ _______.
你可以从总数中选出四个。
考向三：in total总计，总共
eg:___ ____over 100 people came here.
共计100人来到了这里。
A total oftotal numberIn totalExplanation (8:27-8:36)2.increase[ in'kri:s ]v.增加，增大
考向一：increase既可作及物动词又可作不及物动词，其反义词是decrease.也可作名词，常用短语on the increase“正在增加，不断增长”。
eg:These cases are___ ___ _____.
这些案件在不断增加。
考向二:increase by 和increase to 辨析
increase by 指增长了几倍或百分之几，后面加百分数或倍数。increase to指增长到了....后接具体增长后的数字
eg:The population of this city has_______ __5 percent.这个城市的人口增长了5％。 on the increaseincreased byExplanation (8:27-8:36)eg:Our coal output has ________ __ 6 million this year.我们今年的煤产量增加到了六百万吨。
3.one third 三分之一
英语中分数的表达方法：分子用基数词，分母用序数词，分子大于1时，作分母的序数词用复数。
1/2：a half 1/3：one third 1/4：one quarter
3/4：three quarters 3/5：three fifths
做定语时，谓语动词的确定要看名词，名词为可数名词复数，谓语动词用复数；名词为不可数名词，动词用单数
例如： a quarter of water ___ clean.
四分之一的水是干净的。
a quarter of students ____ in the classroom.
四分之一的同学在教室里。 increased toisareExplanation (8:27-8:36)4.be coverd with被...覆盖
辨析:be coverd with和be coverd by
be covered with 是用…………覆盖，be covered by 是被……覆盖。
比如说 大地被雪覆盖，就是
The ground _____ _____ ____ the snow.
洞被布遮住了，就是The hole ___ _____ ___ cloth.
把被动句到过来，变成主动句，比如说，Cover the hole with cloth.用布把洞遮住。with 是用的意思，是人实行的动作。
而大地被雪覆盖那句，是自然形成的，人不能实行的动作，所以不能用with，所以用by。is covered byis covered withExplanation (8:27-8:36)1.The s_____ of the lake is quite still.
2.The t_____cost will be 130 dollars.
3.The earth is a p_____and it goes around the sun.
4.Reading will i________your vocabulary.
5.The land is covered____snow.
A.in B.on C.with D.for
6.The have increased the price of petrol___3％.
A. to B. for C. by D. from
7.It's said that____of the water around the world____polluted.
A. two thirds;has B.two thirds;have
C. two third;are D.two thirds;is
urfaceotallanetncreaseCCDExplanation (8:27-8:36)8.in,we,live,water,can't(.)
_____________________________________
9.deserts,dry,called,these,places,are(.)
_____________________________________
10.must,earth,well,the,treated,be(.)
_____________________________________We can't live without water.These dry places are called deserts.The earth must be treated well.The earth is a very special planet,and it faces a big problem.In the year 2010,the world's population was over 7 billion in total.It is increasing very
总共，总计
quickly.By 2025,the world may have about 8 billion people.And by 2050,the world's population may reach 9 billion.
There is another problem.people can't live everywhere on the earth.We can't live in water,and
在地球上
only about one third of our planet is land.But
三分之一 Lesson 38: The World Is a Big Placeparts of this land are very dry.These dry place are called deserts.Some areas have very high mountains.Others have a lot of snow and ice.It is
a lot of 很多=lots of It is+adj+to do sth.
not easy to live in those places.There are seven continents:Asia,Africa,Australia,Antarctica,Europe.NorthAmericaand South America.Antarctica is covered with snow and ice all year round.Luckily,people can
be covered with被...覆盖 all year round 一年到头
live on the other six continents.On these continents,there are green forests,fresh water and rich lands. Oceans cover two third of the earth's surface.The earth has only one big ocean,but we use these names for its different parts:thePacific Ocean,the Indian Ocean,the Atlantic Ocean and the Arctic Ocean.The Pacific Ocean is the largest one.最大的一个
The earth is our home now,and it will be our home in the future.It must be treated well for our
在将来
children and for our children's children, too!Homework
1. Share with your partner about how you feel after learning.
2. Finish the exercise.
3. Describe one planet you are interested in in your exercise book.