第68页

信息发布者：
What made the air dirty？
C
C
A
C
C
C
B
A
T
F
F
T
F
Keep our city clean 
        There are many things we can do to make our city clean. First, we can put the rubbish into the 
bin. Second, we can ride bikes or take a bus instead of driving our cars. Last but not least, we can 
use less plastic bags. We can use our own cloth bags instead.
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