Where is the Vredefort crater? Where are the Aures Mountains? Where is the Pine Island Glacier? Where is Lake Shawnee? Where is the Valles Caldera? Where is the highest waterfall located? What are the Andes Mountains? Where does the Iguazu River drain?
(scarce) populated areas.They're usually discovered by accident or during helicopter flights of the area.答案(1)考查形容词。句意:南非的弗里德堡石坑是世界上已知最大的陨石坑。修饰名词"impact crater"用形容词,所以用know的形容词known,意为"已知的"。故填known。(2)考查动词时态和语态...