【简答题】75% of the earth’s suce is covered 1 water. However, the world is not only hungry but also thirsty for water. It seems 2 to you, isn’t it? In fact, about 97% of water on the earth is sea water 3 sa...
【简答题】75% of the earth’s suce is covered 1 water. However, the world is not only hungry but also thirsty for water. It seems 2 to you, isn’t it? In fact, about 97% of water on the earth is sea water 3 sa...