TOEFL Listening: TPO-TOEFL阅读TPO - 5JD5SNK19791YA55N$

According to paragraph 2, one effect of the increased agricultural development in the Midwest was to A. slow the rate at which population grew in many Midwestern cities. B. increase the demand for industrial products from Midwestern cities. C. encourage the extension of east-west rail lines to the Midwest. D. reduce the pressure on Midwestern farmers to get their products to market faster.