16．
ImportanceAir is very important to （26）略
．People all over the world are looking for （27）略
to make it clean again．
If we are going to keep （28）略
，we need to breathe clean air．
Reason for air pollution（29）略
smoke looks pretty in the air．But it is not good to breathe．
More and more factories and more and more （30）略
-trucks and planes．

分析 略

解答 略

點(diǎn)評(píng) 略

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