on the air 、in the air 、in the open air的区别

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• 请各位英文大侠来帮我看看这段英文有没有语法上的错误,1．\x05It is reported that ten big cities in China are being ranked among the top twenty cities with the highest pollution index in the world.This means it is high time we did something to bring the situation under control.Many factors are contributing to the deteriorating situation:industrial wastes pumped into the air,the lakes and rivers; a increasing number of automobiles crowding into the streets; the widespread use of pl
• 英语一段,要翻译正确 急~!翻译下 要正确的. Villagers are much healthier than people who live in towns. One reason for this is that country air is fresher than the air in smoky cities. The villager is breathing fresh clean air all day in the fields, but the air the townsman is breathing is always full of smoke and dust.
• 完形填空:the air here is fresh and clean.the people here___friendly.a:isb:arec:be
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• 非谓语动词/高三/英语 I smell something _ in the kitchen.Can I call you back in a minute?①I smell something _ in the kitchen.Can I call you back in a minute?A.burning B.burnt C.being burnt D.to be burnt②At the beginning of class,the noise of desks _ could be heard outside the classroom.A.opened and closed B.to be opened and closed C.being opened and closed D.to open and close第一题答案为A,我错选了C.第二题答案为C.易错选为A.以下是我的疑惑：这两题的非谓语动词中,doing/being done/done 三者的区别是什么?我印象中是这样的.
• the ra-----here is little,so the air is very dry.
• the air here is very b___
• the air here is very c__.
• look ,the bird ------(fly) in the sky.请大家帮忙填写一下.
• if it r___tomorrow,they won't have the patty in the open air.