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胡J涛同志在全国民族工作会议上指出，民族地区存在的困难和问题，归根结底要靠发展来解决，我们必须从全局和战略的高度，充分认识加快民族地区发展的极端重要性，要把“共同团结奋斗，共同繁荣发展”作为新世纪新阶段民族工作的主题。这是因为①民族平等、团结和共同繁荣是我国处理民族关系的基本原则  ②民族平等和民族团结是实现各民族共同繁荣的前提条件  ③各民族的共同繁荣是实现民族平等和团结的物质保证 ④实行民族区域自Strange stones of Costa Rica One of the strangest mysteries in archaeology was discovered in the Diquis River Delta, in southern Costa Rica. Since the 1930s, hundereds of stone balls have been found. They range in size from a few centimetres to over two metres. Who made these perfect spheres (球体) and how they made them remains a mystery. Some researchers believe the stones were made by extreme heating followed by cooling. People could have polished the spheres with sand or leather. The ancient Costa Ricans had no written language so there is no written record of just how they made the spheres, Almost all are made of granite (花岗岩), a hard stone created by volcanoes. The granite quarries (采石场) were 25 to 30 miles away from the largest stones, which weigh more than 10 tons each. Nobody knows how people moved them. Many of the stones have been found near the remains of houses or graves. Some believed that the stones contained hidden treasures and a few have been smashed but nothing has been found inside. Despite these losses, the National Museum of Costa Rica has recorded 130 spheres. However, many stones are not included because they have been removed from their original sites and used as ornaments(装饰) in homes, gardens and churches. Clearly, there are also many stones that lie undiscovered. 56. The stones were discovered ________.       A. near the volcanoes                  B. in the south Costa Rica C. in a grave                               D. in churches 57. The writer ________ in this passage.        A. admires the spheres very much  B. doesn't believe the spheres were once made by humans C. tells us a discovery D. thinks highly of the spheres 58. The underlined word “polished ” refers to ________.       A. buried              B. wrapped           C. made shining    D. made big59. According to the passage, which of the following is TRUE?        A. The stone balls found in the Diquis River Delta are all very huge.B. The stone balls were unearthed in the graves. C. The local people show great interest in the stone balls. D. There are a lot of treasures in the stone balls. 60. The passage mainly tells us ________.       A. the stones are of great value B. the stones proved to be made by non-humans C. the stones are a mystery D. the stones are ornaments