Trees produce oxygen,为什么不是Trees provide oxygen

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• 英语翻译one and a half hectares of trees could produce enough oxygen to keep your whole class alive and healthy for a year.
• Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turnharmful gases from the air ______ oxygen for us to breathe.英语学案上的题
• Trees produce oxygen,为什么不是Trees provide oxygen
• Trees take in harmful gases from the air ang produce oxygen for us to breathe Trees_____ turn
• 求初中牛津英语8A chapter6 more practice的翻译 文如下：Dear friends:Trees are our friends.They work hard for us.They cool our cities and clean the air .They also give out oxygen for us to breathe.Trees reduce sound pollution in cities and make cities more beautiful.Without trees,the soil would be washed away and there would be no food for us to eat.Without trees,it would get too hot for us to live on earth.Without trees,we would die.Trees also provide a lot of thing
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