第67页

信息发布者：
C
A
A
B
B
3
4
1
5
2
dirty
messy
paper
ground
are
bottles
clean
sweep
clean
chairs
help keep the air clean
1. B 2. C 3. C 4. A 5. C
1. C 2. A 3. A 4. B 5. B
dirty, messy, paper, ground, are, bottles, clean, sweep, clean, chairs
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