施心远主编《听力教程》3_(第2版)Unit_13答案.doc

Unit 13 Section One Tactics for Listening Part 1 Spot dictation Sister Rivers Build Cultural Bridge Between U.S. and China The Mississippi is the major river system in the United States, flows almost 3,800 kilometers from a small lake in Minnesota, gathering the waters of 250 other rivers and streams before reaching the Gulf of Mexico. In mid-May, as spring flowers began to open, about 41 students from a dozen colleges, mostly in the Midwest, explored a section of the river in Wisconsin and Iowa, to learn about the environment, and each other. The students, from the U.S., China and around the world, came to join the River Spirit Exchange program. The cross-cultural educational experience - set up by the University of Wisconsin, Madison-based Environment and Public Health Network for Chinese Students - focuses on the Mississippi and Chinas longest river, the Yangtze. This three-day get-together featured story-telling, hiking, camping and canoeing, all part of a larger lesson about conservation projects that can be used on both the Yangtze and Mississippi. After the group met at the Crane Foundation preserve, they headed south to canoe a stretch of the Kickapoo River that winds its way through southwestern Wisconsin before joining the Mississippi. They paddled along a stretch of the Kickapoo River, where a 20-year preservation venture stopped encroachment by developers and protected the natural setting of the waterway. The students on the River Spirit Exchange ended their first night with singing and stories around the campfire. Organizers say the success and spirit of this first gathering of students will lead to other trips, including one down the Yangtze. Part2 Listening for Gist Four out of five of all children who got leukemia* in 1960 died. Now four out of every five survive. The secret of this miraculous change is the rosy periwinkle*, a forest flower which tribal doctors had used for centuries. The United States National Cancer Institute has identified