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信息发布者：

drive

bad

dirty

use

much

rivers

fish

trees

clean

help

b

e

a

c

d

S: To protect the Earth, we should plant

more trees.

S: To protect the Earth, we should walk to

school.

S: To protect the Earth, we shouldn't cut

down too many trees.

S: To protect the Earth, we shouldn't throw

rubbish into the river.

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