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people
人们
bikes
自行车
What can we see on the earth?
Let’s protect the
earth together!
should
shouldn’t
What should we do for the earth?
keep the rivers clean
Which picture do you like?
We should
picture 2
picture 1
.
litter
We shouldn't litter.
keep the air clean and fresh
We should
.
plant more trees
We should
.
use bikes instead of cars
We should
.
wild animals
kill wild animals
We shouldn’t kill wild animals.