英语选择题Trees _____harmful gases from the air and ____oxygen.Ye
英语选择题Trees _____harmful gases from the air and ____oxygen.Ye
Trees take in harmful gases from the air ang produce oxygen
This,together with the gases and fumes from vehicles,___rain
60% of air pollution is from waste gases of vehicles and in
英语选择题-The air is cool and clean.
这句话对吗?Greenhouse gases keep heat in the air and make the ear
waste gases p____ the air and do great harm to our health请填词
又一英语选择题._______years ago,coal was from trees and other plant
英语解释句子1.Trees can cool the air and clean it.2.When insects a
一道英语选择题1.The trees in the forest can keep rain drops from hi
一道高一英语选择题One third the country xxx covered with trees and th
英语选择题-The air is cool and clean.-Yes,It ___ last night.