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课程与PC端同步更新，充分利用零碎时间。做题
海量精选试题，想练就练，瞬间提分。答疑
网校名师24小时在线答疑解惑直播
名师大咖面对面，有问有大收获多。尤其是task6，切忌狂记，一定要有选择性的去记笔记。
这个是2015年6月份的一道考题
题目
Using the examples from the lecture, explain two ways the railroad system changed business in the United States.
部分原文：
Ok, so we’ve been talking about various factors that have changed the United States’ economy. One especially important factor is the development of railroads. When the railroad system expended to almost the US, it fundamentally changed the way business perform in this country.
For one thing, it expanded and the railroad enable companies to start selling their goods to all of the country. Since trains could now transport merchandise all over US, companies could now sell good to customers pretty much anywhere of the country.
For example. There was a big company that sold quartz. The company started in a big city. And before the development of railroad, the company could only sell its quartz to people living in or near the city. But when the railroad expanded, the co
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