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第68頁(yè)

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What made the air dirty？

C

A

C

B

A

T

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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