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One problem
The population is increasing very quickly.
Another problem ?
Can we live anywhere on the earth?
People can’t live everywhere on the earth.
71%
29%
Only one third of our planet is land.
Oceans cover two thirds of the earth’ surface.
one third 三分之一
two thirds 三分之二
分子基数词，分母序数词，分子大于一，分母加s。
For example one fourth 四分之一
two fourths 四分之二
Exercises
1.One fourth of the students ________(be) from the countryside.
2. Two fifths of the water ___(be) clean.
are
is
How many continents are there in the world?
What are they?
Think About It
North America
South America
Europe
Asia
Australia
Antarctica
Antarctica is covered with snow and ice all year round
Luckily,people can live on the other six continents