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

课件17张PPT。Welcome to our class! Lesson 38 The World Is Big a PalceNew Wordsplanet /'pl?n?t/ n. 行星
billion /'b?lj?n / n. 十亿，千兆
total /'t?utl / n. 总计；总数
increase / ?n'kri?s /v. 增加；增大
surface /'s??f?s/ n. 表面；表层
Indian /'?ndj?n/? adj. 印度的 n. 印度人
Atlantic /?t'l?nt?k/ n&adj. 大西洋（的）
Arctic /'ɑ?kt?k /adj. 北极的planet 行星英语的计数单位1,000,000,000million 百万billion 十亿thousand 千hundred 百increase 和 decreaseListen to the passage and answer the questions1.When was the world’s population over 7 billion in total?
In the year 2010.
2.When will the world have about 8 billion people ?
By 2025.
3.When may the world’s population reach 9 billion?
By 2050.
4.How many continents does the world have? what are they?
There are seven continents.
5.How many oceans does the world have? what are they?
There are four main oceans.
There are seven continents.Asia 非洲
Africa 亚洲
Australia 南美洲
Antarctica 北美洲
Europe 欧洲
North America 南极洲
South America 大洋洲
There are four main oceans.the Pacific Ocean 大西洋
the Indian Ocean 北冰洋
the Atlantic Ocean 太平洋
the Arctic Ocean 印度洋
Knowledge point年份的读法：一般情况把表示年份的四位数字按前后分为 两组，每一组的数字用基数词来读。
2010读作：twenty ten
2025读作：twenty twenty-five
2050读作：twenty fifty
by 2025 by: 到……之前；不迟于
hundred, thousand, million, billion这些都是英语的计数单位与具体数字连用不加S，除非短语hundreds of, thousands of, millions of;billions of?Antarctica is covered with snow and ice all year round.
南极洲常年被冰雪覆盖。
be covered with 被……覆盖（be + 动词过去分词称之被动语态）
all year round 一年到头Practice一.英汉短语互译
1．三分之一_______________________________________
2．被……覆盖______________________________________
3．all year round_____________________________________
4．two thirds________________________________________
5．in the future______________________________________
?
one thirdbe covered with..全年三分之二在将来1. Two ______ (three) of the earth surface is oceans.
2. The earth is a special one of all the ______ (planet).
3. There are ________ of people in the world.
A. billion　 B. billions C. seven billion D. seven billions
4. _______ of the earth’s surface is water.
A. One third B. One thirds C. Two third D. Two thirds
thirdsplanetsBDSummaryHomeworkFinish the exercise.
Write a short passage about how to protect our only home——— the earth.
Thank you!