Where is air pollution come from?和Where does air pollution comes from?的区别?Where is air pollution come from?和Where does air pollution come from的区别？

连词成句.the,where,air-conditioner,is,) Where is air pollution come from?和Where does air pollution comes from?的区别?Where is air pollution come from?和Where does air pollution come from的区别？ There isn't _____ air near where I live._____ nearest airport is 110 kilometers away. Don't go to __ places where there is no fresh air. The doctor advised the patient to live______the air is fresher.A.in where B.in which C.the place where D.where Air is to us___water is to fesh.A.that B.what C.where D.how 选什么?为什么? The air is what is air There is air c_____. There is air e____. There is( )air-conditioner. The air is c( ) what is air resistance Gemerally,air is heavily polluted _______ there are factories.A)where B)when C)if D)whether -Mom , what did your doctor say ? -He advised me to live where the air is fresher .汉语翻译 He advised me to live _____the air is fresher.为什么填where,而不可以填in which 根据所给词的适当形式填空（earth feel but answer thin of where high air ang） 文章：what is sky where is it?how high is it?they aren't easy to( ),Is the sky blue?the sky has no colour.is the sky full( )air?we know that there is air ar where does air polliution come from?