课件21张PPT。 Know our worldUnit 7 The World Is a Big PlaceLesson 38 Lesson 38
The World Is a Big Place课文呈现知识讲解…………词汇
听写课堂导入课文1课堂小结课后作业…课堂练习 同学们，上一课学习的单词你们都掌握了吗？现在大家来检验一下，点击下面的音频开始听写吧！All of us have studied geography. Can you say the names of the continents and oceans in the world?THINK ABOUT IT
·How many continents are there in the world? What are they?
·What do you know about the place where you live?How many continents and
oceans does the world have?
Can you point them out?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 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 only about one third?of our planet is land. But parts of this land are very dry. These dry places are called deserts. Some areas have very high mountains. Others have a lot of snow and ice. It is not easy to live in those places.There are seven continents: Asia, Africa, Australia, Antarctica, Europe, North America and South America. Antarctica is covered with? snow and ice all year round. Luckily, people can live on the other six continents. On these continents, there are green forests, fresh water and rich lands.
Oceans cover two thirds of the earth's surface. The earth has only one big ocean, but we use these names for its different parts: the Pacific Ocean, the Indian Ocean, the Atlantic Ocean and the Arctic Ocean. The Pacific Ocean is the largest one.The earth is our home now, and it will be our home in the future. It must be treated well for our children and for our children's children, too！ increase/?n'kri?s/v.增加；增大考向一increase既可作及物动词也可作不及物动词，其反义词为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 on the increase.
这些案件在不断增加。
His power increased.
他的权利加强了。知识点1考向二【重点】辨析increase by与increase to典例—The price of food, drinks and clothes ________
so quickly these years.
—Oh, no, but I don’t think so.(荆门)
A．develops B．raises
C．improves D．increases【点拨】采用词义辨析法。句意：——近年来，食物、饮
料和服装的价格上涨很快。——噢，不，可我不这么想。
develop发展；raise提高；improve改善；increase上涨。D one third三分之一知识点2 分数表达法：分子用基数词，分母用序数词。分子如果大于1，分母用复数形式。
提示：二分之一不能说a/one second，而要说 a/one half; 四分之一和四分之三常用a quarter和 three quarters 表示。
eg：Two thirds of the students in our class are girls.
我们班三分之二的学生是女生。考向【易错点】典例________ of the students in Class 6 have lunch at school. (兰州)
A．Two fifth B．One thirds
C．Three fifth D．Three quarters【点拨】考查分数的表达。分数由基数词和序数词构成，
分子用基数词，分母用序数词，分子大于1时，分母用复
数，排除A和C；分子是1时，分母用单数，排除B；three
quarters四分之三。D考向【重点】 当分数＋of结构作主语时，谓语动词的单复数取决于of后面的名词，名词为可数名词复数，谓语动词用复数；名词为不可数名词，谓语动词用单数。
eg：Three quarters of the information is true.
四分之三的信息是真实的。典例—Mum，_______ of the apples ______ gone bad.
—We'd better eat up the rest as soon as possible.
(内江)
A．one third; have B．one thirds; have
C．one third; has D．first three; has【点拨】分数由基数词和序数词构成，分子用基数词，分
母用序数词，分子大于“1”时，分母用复数。分数修饰
可数名词复数时，谓语动词用复数；分数修饰不可数名
词时，谓语动词用单数。A be covered with 被……盖知识点3考向辨析 be covered with与be covered by典例—Why does the earth look blue in space?
—Because most of the earth’s surface ________
by ocean.(黄石)
A．covers B．is covered
C．cover D．are covered【点拨】句意：——为什么在太空中地球看起来是蓝色
的？——因为地球表面大部分被海洋覆盖着。根据句意
可知采用被动语态，排除A和C；另外，surface为不可数
名词，be动词用is。BRead the lesson and match each paragraph with its main idea.
Let's Do It !Paragraph 1 a.Six of the seven continents are good for people to live on.
Paragraph 2 b.We should treat the earth well.
Paragraph 3 c.An increasing population is a big problem for the earth.
Paragraph 4 d.Two thirds of the earth is covered with oceans.
Paragraph 5 e.People cannot live everywhere on the earth.
2) Fill in the blanks with the correct forms of the words in
the box.Let's Do It !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 it may be the ________ season of the year.
4．The ________ of our body is skin. It protects us.
5．How many ________ of people are there in the world now?increasingtotal driestsurfacebillions3) Match the seven continents with their correct descriptions.Let's Do It !It is the biggest continent. It has the highest point
on the earth in the Himalayas. Europe
South America
Asia
Africa
Australia
Antarctica
North America It is the smallest continent. You can find koalas and
kangaroos there.It is the sixth largest continent. It is a good place for people to travel to.It is the fifth largest continent. The South Pole is on this continent.It is the fourth largest continent. There are 13 countries
on this continent.It is the third largest continent. Canada, Mexico and the
U．S. are the three major countries on this continent.It is the second largest continent. Many elephants, giraffes, zebras and lions live there.本节课我们主要学习了以下重点内容：
（1）重点单词：increase
（2）重点短语：be covered with1.熟记所学单词，短语等知识点并各造一个句子
2.完成本课时的课后作业
