中国疆域辽阔,5400公里,南北长5500公里。最北端为漠河附近的______,最南端为______。 China has a vast territory, 5400 kilometers long from east to west and 5500 kilometers from north to south. The area is about 9.6 million square kilometers. The northernmost end is ______near Mohe, and the southernmost end is_______.