题目

NASA is moving ahead with plans to put a long-armed lander on Mars’ icy north pole to search for clues① for water and possible signs of life. The $386 million Phoenix Mars is planned to touch down in the Martian arctic in 2008. The stationary probe will use its robotic arm to dig into the icy land and pick up soil samples② to analyze. In 2002, the Mars Odyssey orbiter spotted evidence of ice-rich soil near the arctic surface. Scientists hope the Phoenix mission will find clues to the geologic history of water on the Red Planet and determine whether microbes③ existed in the ice. Phoeni读图，完成下列要求（1）写出字母所代表大州的名称：A______B______    C______（2）写出数码所代表的海域名称  ①______    ②______（3）写出大洲之间分界线的名称，A洲与B洲的分界线：a______山，b______河，c______山．