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地球
th
ly
Unit 7 Protect the Earth
oil
coal
wood
water
the Earth
plastic
wood
sit
chairs
We use wood to make chairs.
We use chairs to sit.
use...to...
Let’s learn!
We should...
save water.
Let’s learn!
Water is useful.
In many places, there is not much water.
reuse
We should not waste water.
waste
节 约
coal
oil
our comes from coal and oil.
energy