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What do you know about the place where you live?
How many continents are there in the world? What are they?
Think About It
North America
South America
Antarctica
Australia
The world's map
Africa
Asia
Europe
Arctic Ocean
Indian Ocean
Atlantic Ocean
Pacific Ocean
planet n. 行星
billion n. 十亿；千兆
total n. 总计；总数 adj.总的；总计的
increase v. 增加；增大
surface n. 表面；表层
Indian adj. 印度的 n. 印度人
Atlantic n.& adj. 大西洋（的）
Arctic adj. 北极的
New words:
1. The (地球) is divided into seven continents.
2. The moon is a (行星).
3. One fifth of the earth's (表面) is covered with desert.
earth
surface
planet