The air in Beijing is getting much _____ now than a few years ago.A.clean B.cleaner C.cleanest D.the cleanest哪个正确,理由?

I flew in the open air i like swimming in an__ ( in the open air)poor he is going to nanning ()air.heneeds to()the plae in beijing My students asked me-----------I would go to Beijing by air the next year in the open air stick in the air in the air是什么意思 in the air on the air 翻译：when i was in the open air again I(w ) in beijing I was in Beijing( ) i like beijing,the place which i had lived in .是否等于:i like beijing where i had lived in. I can feel it in the air tonight 另外 in the air tonight 请专业人士回答下~ I was in Beijing on the day when he arrived. I bought s___ in the Palace Museum of Beijing. He asked me that if I would go to Beijing by air the next day改正病句,并说明原因 are there__________people in the park?my father is going to Beijing by air tomorrow.（改为同义句）my father _________ __________ to Beijing tomorrow. 辨析 in the air,on the air,in air,on air