问题描述：
1.空气污染来自于哪?用英文怎么说.
2.The teachers are at work,()()the teachers.
3.the chicken wing smells nice()()the chicken wing()?
4.the smoke comes from the factory.
()()the smoke ()from?
1.where( )
2.The teachers are at work,()()the teachers.
3.the chicken wing smells nice()()the chicken wing()?
4.the smoke comes from the factory.
()()the smoke ()from?
1.where( )
问题解答：
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