初中英语河北加拿大版学生用书49

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[00:00.00]和谐英语学习网 UNIT 7
[00:03.21]Lesson 49~56
[00:07.86]Know Your World
[00:11.23]Lesson 49:
[00:14.79]The World Is a Big Place!Let's learn some geography!
[00:21.55]Geography is the study of the world's places and population.
[00:28.71]How many people are there in the world?
[00:33.28]In the year 2000,the world's population was about six billion people.
[00:41.14]That's 6,000,000,000By 2025,
[00:53.29]sicientists predict the world will have 7.8 billion people.
[01:00.55]By 2050,there will be 9.1 billion people.
[01:08.49]Where do all the people live?People live on land.
[01:14.66]About one-third of the world is land.
[01:19.62]There are seven continents:Africa,Asia,Australia,Europe,North America,
[01:30.17]South America and Antarctica.
[01:35.14]Antarctica is the world's coldest and the world's driest continent.
[01:42.69]How many deserts does the world have?
[01:47.26]Not all land is good for people.Some land is too dry.
[01:55.02]This land is called desert.
[01:59.17]Deserts cover one-fifth of the earth's surface.
[02:04.81]How big are the world's oceans?
[02:09.38]The world really has one big ocean,
[02:15.13]but we have names for different pieces of it.
[02:21.01]There are four main oceans:the Pacific Ocean,the Atlantic Ocean,
[02:28.87]the Indian Ocean and the Arctic Ocean.
[02:33.94]Oceans cover about three-quarters of the earth's surface.
[02:40.29]What's the world's biggest island?
[02:44.55]The world's biggest island is Greenland.
[02:49.27]Greenland is northeast of Canada.What's the world's longest river?
[02:57.53]The Nile River in Africa is the longest river.