【简答题】A.The active volcanoes in the Antarctic. B.The icebergs and volcanoes around the world. C.How to pr the eruption of volcanoes. D.Volcano can protect ice sheet from melting.
【简答题】A.The level of education varies around the world. B.The economists' attitudes to population differ greatly. C.The living standard varies from country to country. D.The countries' attitudes to populati...