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We can find them under the ground.
They make energy.
They are very useful but limited(有限的).
paper
plastic
wood
coal
oil
wood
plastic
oil
coal
paper
Earth
water
Save _______
Save _______
Save ________
Don’t __________
_______________
trees
energy
use too
much plastic
回忆课文内容，找出不正确的信息。
1. We drink water and use water to clean things.
Save water
2. There is much water in the world.
2. There is not much water in many places.
3. We can reuse water and save it.