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鎮ㄧ幇鍦ㄧ殑浣嶇疆锛 棣栭〉 > SAT > SAT姣忔棩涓棰 > 姝f枃

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One of the primary shortcomings of the Homestead Act of 1862, a program through which the federal government offered free plots of land to US citizens willing to establish farms in the American West, was that the plots were too small to sustain a farm. Land in the semiarid Great Plains region received twenty or fewer inches of rain per year, so plots there were best left half unplanted each growing season to conserve water. With farms consisting of a mere 160 acres, however, this practice would not have produced sufficient harvests. Granted, raising cattle was impossible because the tiny homesteads would quickly become overgrazed. According to geologist and explorer John Wesley Powell, sustainable homesteads on the Great Plains actually needed to be a staggering 2,560 acres.

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B.That is to say,
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factor ['fæktə]

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n. 鍥犵礌锛屽洜瀛
vt. 鎶 ... 鍥犵礌鍖呮嫭

鑱旀兂璁板繂
solution [sə'lu:ʃən]

鎯充竴鎯冲啀鐪

n. 瑙g瓟锛岃В鍐冲姙娉曪紝婧惰В锛屾憾娑

鑱旀兂璁板繂
equation [i'kweiʃən]

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n. 鐩哥瓑锛屾柟绋(寮), 绛夊紡锛屽潎琛

鑱旀兂璁板繂
multiple ['mʌltipl]

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adj. 璁稿锛屽绉嶅鏍风殑
n. 鍊嶆暟锛屽苟鑱

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unique [ju:'ni:k]

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adj. 鐙竴鏃犱簩鐨勶紝鐙壒鐨勶紝绋缃曠殑

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