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Arctic /'ɑ?kt?k /adj. 北极的
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1,000,000,000
million 百万
billion 十亿
thousand 千
hundred 百
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Point out the continents and oceans.
How many continents does the world have?
How many oceans does the world have?
When was the world’s population over 7 billion in total?
When will the world have about 8 billion people ?
When may the world’s population reach 9 billion?
What’s the problem the earth faces?
How much of our earth’s surface is land?
How much of the earth’s surface is oceans?
Why can’t people live on Antarctica?
What are the names for different parts of the big ocean?
How many continents and oceans does the world have?(have 与there be互换）
How many continents and oceans are there in the world?
planet行星 eg. The earth is a planet.
star 恒星 eg. The sun is a star.
face 名词：脸；面孔 动词：面朝；面对；面临
年份的读法：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