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.
篮球是我的最爱(Basketball is My Favorite)
做三明治的过程
我对考试的看法(My Views on Examinations)
你对排队日的看法
永远长不大的小天使(Little Angels Forever grow up)
日记(English Diary)
中考英语考前必备--议论文写作模板
中考英语辅导:互联网(TheInternet)
中考英语辅导:我的旅行(Mytrip)
传统的节日(Traditional festional)
中考英语辅导:我的一个朋友(AFriendofMine)
知识和信心通向成功之路(Knowledge and Confidence Lead to Success)
对班级群体活动的看法(Comment on class group activity)
我最喜欢的人(My Favourite Person)
寒假去哈尔滨旅游
中考英语书面表达常犯错误分析
伟大的中国,我爱你!(Great China, I love you!)
保卫地球(Saving the Earth)
我繁忙的学习生活(My busy study life)
中学生正确的放松方式(The proper ways for students to relax)
中考英语辅导:新鲜空气(FreshAir)
中考英语辅导:我的星期天(MySunday)
中考英语辅导:上海的公共交通(ThePublicTransportinShanghai)
做三明治的过程
传统的节日(Traditional festional)
国庆节作文:A Wonderful Traveling
中考英语辅导:上学路上(OnMyWaytoSchool)
关于中学生饮食健康的
第一场雪(First Snow)
介绍朋友的生活与饮食习惯
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