step:总结了185的3篇,旅游类完毕

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step:跟读模仿
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# d2 b% `3 Z1 G4 i$ Q; R% t问题:我最近的时间安排很有问题,很多事情,就让自己乱了阵脚,这怎么可以?

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第六篇(美国发展史)
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0 V1 ^" @* t6 ]5 l/ {+ b" |Today we are going to look a way in whick legislation can create practial problem,which in turn to inventions to solve these problems. you recall that the home state acts at 1862 granted a hundred sixty acre plots to settlers . This resulted in considerable population growth in westen plains. in that same tear the construction of transcontinental rainroad was set up by the pacific railroad act. These 2 pieces of legislation made the necessary for ranchers to limit the movement of their cattle instead of letting them roam freely. They weren't many trees or rocks to use for the fencing material so planting hedges was tried but they take long time to grow. Smoothly organized wire fence were another idea but they were not strong enough. Finally inspired by the reaction of cattle to the sharp thorns on vegetation, a new fence was invented--barbs, sharp, wire points like thorns were twisted onto wire fencing. Not everyone accepted the invention right away, Texas were resistance untill the young sales man staged the dratic demonstration. He put up the career all of the new barbed wire and challenge cattle owner to put thir wild animals in it. Untrusting spectators get their distance as the cattle were driven into the enclosure. the animals charge the fence look quickly retreated. testing was sold and new fence soon became common throughout the plains