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Unit7 What’s the highest mountain in the world?
the earth
We live on the earth.
We have only one earth.
China is in Asia.
It has the biggest population in the world.
It is one of the oldest countries in the world.
A: Which is the longest river in China?
the Yellow River
the Yangtze River
B: The Yangtze River.
Zhujiang River
A: Which is the longest river in the world?
B: The Nile.
length: 6,671 kilometers
how to read numbers
How to read the numbers
64
264
1,264
14,456
2,140,456
0.4
24.64
2,140,456.64
从右往左，每满三个数字要加一个逗号
第一个逗号，可记作 thousand
第二个逗号，可记作million