...没安门导小What covers three-fourths of the Earth's surface...
根据“What covers three-fourths of the Earth's surface? It's the water that makes up the Earth's four oceans. They are the Pacific. the Atlantic. the Indian and the Arctic”可知第一段主要介绍的是地球四大海洋的水覆盖了地球表面四分之三。故选A。2. 词义猜测题。根据“it is never still”...