Space-Age Archeology Its a strange partnership, but a very effective one: Satellites and space-shuttle-carried radar are helping archeologists. How? By seeing through sand or through treetops to locate important archeological sites. Take, for example, the second 1981 flight of the Space Shuttle Challenger. During that mission, a powerful, experimental radar was pointed at a lifeless stretch of desert in Egypt called the Selima Sand Sheet . To everyones surprise, the radar penetrated through the sand to the harder rock beneath. On the surface, there is a little indication that Africas Sahara Desert was never anything but a desert. When the archeologists studied the radar images, they saw what seemed to be impossible: there was sand-buried landscape that was shaped by flowing water; traces of ancient riverbeds appeared to be over nine miles wide, far wider than most sections of the present-day Nile River. Today, the area is one of the hottest, driest desert in the world. More recently, Landsat 4, a special Earth-mapping satellite, aided in the discovery of ancient Mayan ruins in Mexico. Landsat can, with the help of false-color imagery, see through much of the area. Armed with these maps, a five-person expedition took to the air in a helicopter. 41 With the help of the space-shuttle-carried radar, archeologists found B traces of ancient riverbeds under the Sahara Desert. D a mountain beneath the Sahara Desert. A It was an old avenue, C It was shaped by flowing water. 43 The stream-rounded pebbles and Stone-Age axes which were found along the ancient river banks show that B ancient people didnt know how to make weapons. D early humans were good at fighting with sharp weapons. A old New England fences. C the expedition members. 45 Which of the following best summarizes the main information of the passage? B Without high-tech, the archeologists work would come to a stop
D High-tech makes the archeologists work more fruitful.
2016高考英语总复习精选课件(江苏专用)牛津译林版选修7《Unit 4 Public transport》
2016年高考总复习优化英语课件(四川专用)写作教程:Module3
2016高考英语总复习精选课件(江苏专用)牛津译林版选修8《Unit 1 The written world》
2016高考英语总复习精选课件(江苏专用牛津译林版)语法专项突破:二、名词、冠词
2016高考英语总复习精选课件(江苏专用牛津译林版)专项提能计划:阅读理解(二)
2016高考英语总复习精选课件(江苏专用牛津译林版)专项提能计划:阅读理解(三)
2016高考英语总复习精选课件(江苏专用牛津译林版)语法专项突破:七、时态和语态
2016高考英语总复习精选课件(江苏专用)牛津译林版选修6《UNIT3-4》佳作晨背·文思泉涌
2016高考英语总复习精选课件(江苏专用牛津译林版)专项提能计划:书面表达(七)
2016高考英语总复习精选课件(江苏专用牛津译林版)专项提能计划:书面表达(六)
2016高考英语总复习精选课件(江苏专用牛津译林版)专项提能计划:书面表达(三)
2016高考英语总复习精选课件(江苏专用)牛津译林版选修8《Unit 2 The universal language》
2016高考英语总复习精选课件(江苏专用牛津译林版)专项提能计划:书面表达(一)
2016高考英语总复习精选课件(江苏专用牛津译林版)专项提能计划:书面表达(八)
2016高考英语总复习精选课件(江苏专用牛津译林版)语法专项突破:一、代词
2016高考英语总复习精选课件(江苏专用牛津译林版)语法专项突破:十一、特殊句式
2016高考英语总复习精选课件(江苏专用牛津译林版)专项提能计划:完形填空(四)
2016高考英语总复习精选课件(江苏专用牛津译林版)语法专项突破:六、情态动词和虚拟语气
2016高考英语总复习精选课件(江苏专用牛津译林版)语法专项突破:五、非谓语动词
2016高考英语总复习精选课件(江苏专用牛津译林版)专项提能计划:书面表达(五)
2016年高考总复习优化英语课件(四川专用)写作教程:Module1
2016年高考总复习优化英语课件(四川专用)写作教程:Module4
2016高考英语总复习精选课件(江苏专用)牛津译林版选修8《UNIT1-2》句型公式妙笔生花
2016年高考总复习优化英语课件(四川专用)阅读教程:句型公式
2016高考英语总复习精选课件(江苏专用)牛津译林版选修7《Unit 3 The world online》
2016高考英语总复习精选课件(江苏专用)牛津译林版选修8《Unit 4 Films and film events》
2016高考英语总复习精选课件(江苏专用)牛津译林版选修6《Unit 1 Laughter is good for you》
2016高考英语总复习精选课件(江苏专用)牛津译林版选修7《Unit 2 Fit for life》
2016高考英语总复习精选课件(江苏专用)牛津译林版选修8《Unit 3 The world of colours and light》
2016高考英语总复习精选课件(江苏专用牛津译林版)语法专项突破:十、状语从句