【简答题】A.Ozone as a form. of oxygen. B.Problems caused by the thinning of the ozone layer. C.The origin of ozone problems. D.The latest studies of ozone problems.
【简答题】The ozone layer(臭氧层) is a thin layer of gas around the earth. It forms a special “blanket” around the planet. This “blanket” protects the earth from erous rays produced by the sun. Without the ozo...