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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
1,000,000,000
million 百万
billion 十亿
thousand 千
hundred 百
increase 和 decrease
Listen to the passage and answer the questions
1.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.