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为了帮助大家备考托福阅读，练习更多阅读题目。提高阅读水平，下面小编给大家带来托福阅读辅导:老托福阅读真题及答案 PASSAGE 29，希望对大家有所帮助!

:老托福阅读文本 passage29

During the second half of the nineteenth century, the production of food and feed crops in the United States rose at an extraordinarily rapid rate. Corn production increased by four and a half times, hay by five times, oats and wheat by seven times. The most crucial f

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