----How terrible the air is!
Yes,if there are ___trees, there will be ___air pollution in our city.
| A．less more | B．more less |
| C．less less | D．more more |
----How terrible the air is!
Yes,if there are ___trees, there will be ___air pollution in our city.
| A．less more | B．more less |
| C．less less | D．more more |
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