题目

Scientists have found amounts of water molecules inside rocks and soil samples from Mars before. But an ancient meteorite (陨石) found recently contains 10 times more water and much more oxygen than any Martian I meteorite ever before discovered. What’s so wild about this wet discovery? It could mean that the Red Planet once had enough water to have I liquid flowing on the planet’s surface. It was once believed that if Mars ever had water at all, its water would have been small amounts of ice below the surface or existing in the soil only as hydrogen and oxygen---the elements thatA图中苹果的位置为（2，3），则梨的位置可以表示为（44，44），西瓜的位置记为（55，11）．B图中，A点用数对表示为（1，1），B点用数对表示为（55，11），C点用数对表示为（33，33），三角形ABC是等腰直角等腰直角三角形．