we take harmful gas from the air and g(----) off oxygen
Trees take in harmful gases from the air ang produce oxygen
When we breathe,the oxygen in the air() with our blood and g
The harmful gas from the factories pollutes th air.The harmf
We ____ in oxygen in the air
dirty gas from cars and factories We find this in air or wat
The ___ of oxygen in the air rises, and at last the air beco
The gas is off
why should we turn off cellphone in the gas station?
The air was polluted by the gas from the factoties.The p____
gas oxygen 怎么翻译
Is oxygen the only gas( ) helps fire burn?
英语翻译The plane will take off from Beijing Capital Airport and