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keep …clean
should not cut down…
use plastic to…
Too much plastic is bad for…
should not use …
should …
Why ?
How ?
coal
oil
wood
Protect the Earth
white pollution
白色污染
Let’s talk
We use plastic to ….
We use wood to …
Let’s say
We use water to… .
We
use water
to
We
use plastic
to
We
use wood
to
clean things.
make bags and bottles.