【简答题】The total area of land on earth is about 149 million square kilometers, or about 29 percent of the total area of the earth. The average height of the land is about 750 metres above the sea level. The ...
【简答题】阅读理解。 The total area of land on earth is about 149 million square kilometers, or about 39 percent of the total area of the earth. The average height of the land is about 750 metres above the sea level...