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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.

A.NO CHANGE
B.That is to say,
C.Nevertheless,
D.Moreover,

重点单词   查看全部解释    
additional [ə'diʃənl]

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adj. 附加的,另外的

 
conserve ['kɔnsə:v,kən'sə:v]

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n. 蜜饯,果酱
vt. 保存,与糖放在一起,

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sufficient [sə'fiʃənt]

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adj. 足够的,充分的

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nevertheless [.nevəðə'les]

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adv. 仍然,不过
conj. 然而,不过

 
cattle ['kætl]

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n. 牛,家畜,畜牲

 
logical ['lɔdʒikəl]

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adj. 符合逻辑的,逻辑上的,有推理能力的

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transition [træn'ziʃən]

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n. 过渡,转变

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claim [kleim]

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n. 要求,要求权;主张,断言,声称;要求物

 
impossible [im'pɔsəbl]

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adj. 不可能的,做不到的
adj.

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impossibility [im.pɔsə'biliti]

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n. 不可能之事,不可能,不可能性

 
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