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　　【听力原文- lecture 2】

　　原文：lecture 2

　　The partial skeletons of more than 20 dinosaurs and scattered bones of about 300 more have been discovered in Utah and Colorado at what is now the Dinosaur National Monument. Many of the best specimens may be seen today at museums of natural history in the larger cities of the United States and Canada. This dinosaur pit is the largest and best preserved deposit of dinosaurs known today. Many people get the idea from the mass of bones in the pit wall that some disaster, such as volcanic explosion or a sudden flood, killed a whole herd of dinosaurs in this area. This could have happened, but it probably did not.

　　The main reasons for thinking otherwise, other scattered bones and the thickness of the deposit in other deposits where the animals were thought to have died together, the skeletons were usually complete and often all the bones were in their proper places. Rounded pieces of fossil bone have been found here. These fragments got their smooth, round shape by rolling along the stream bottom. In a mass killing, the bones would have been left on the stream or lake bottom together at the same level. But in this deposit, the bones occur throughout a zone of sandstone about 12 feet thick.

　　The mixture of swamp dwellers and dry land types also seems to indicate that the deposit is a mixture from different places. The pit area is a large dinosaur graveyard--- not a place where they died. Most of the remains probably floated down eastward flowing river until that were left on a shallow sandbar. Some of them may have cone from far away dry land areas to the west. Perhaps they drowned trying to cross a small stream, all washed away during floods. Some of the swamp dwellers may have got stuck in the very sandbar that became their grave. Others may have floated for miles before being stranded.

　　Even today, similar events take place: when floods come in the spring, sheep, cattle, and deer are often trapped by rising waters and often drown. Their dead bodies float downstream until the flood recedes, and leaves them stranded on a bar or shore where they lie, half buried in the sand until they decay. Early travelers on the Missouri River reported that shores and bars often lined with the decaying bodies of buffalo that had died during spring flood.

　　Question 19: Where can many of the best dinosaur specimens be found in North America?

　　Question 20: What occurs to many people when they see the massive bones in the pit wall?

　　Question 21: What does the speaker suggest about the large number of dinosaur bones found in the pit?

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　　【题目解析】

　　Q19. 根据听力原文“The partial skeletons of more than 20 dinosaurs and scattered bones of about 300 more have been discovered in Utah and Colorado at what is now the Dinosaur National Monument.”可知在北美洲找到的最佳恐龙样本的地点。

　　Q20. 根据听力原文“Many people get the idea from the mass of bones in the pit wall that some disaster, such as volcanic explosion or a sudden flood, killed a whole herd of dinosaurs in this area.”可知人们对于发现大量恐龙骨骼的态度。

　　Q21.根据听力原文“Most of the remains probably floated down eastward flowing river until that were left on a shallow sandbar. Some of them may have cone from far away dry land areas to the west.”就可以锁定作者对于这些遗骨的分析和观点。

　　【题目解析】

　　本题从发现恐龙的标本入手，引出了全文的讨论。全文出现了很多较为的专业词汇，比如“pit wall”“swamp”，对考生的词汇量有一定的要求，这就体现出了六级听力的难度。在问题的考察上，三道题均属于考察细节题，并且均是针对前三段内容进行提问，考生在练习过程中还是要注意提高听清要点、把握关键信息点的能力。

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