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  3. The agricultural revolution in the nineteenth century involved two things: the invention of labor saving machinery and the devel

The agricultural revolution in the nineteenth century involved two things: the invention of labor saving machinery and the devel

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问题     The agricultural revolution in the nineteenth century involved two things: the invention of labor saving machinery and the development of scientific agriculture. Labor saving machinery naturally appeared first where labor was【S1】______."In Europe", said Thomas Jefferson, "the object is to make the【S2】______of their land, labor being abundant; here it is to make the most of our labor,【S3】______being abundant." It was in America, therefore, that the great【S4】______in nineteenth century agricultural machinery first came..
    At the opening of the century, with the【S5】______of a crude plow, farmers could have carried practically all of the existing agricultural implements on their backs; by 1860, most of the【S6】______in use today had been designed in an early form. The most important of the early inventions was the iron plow. As early as 1790 Charles Newbold of New Jersey had been【S7】______on the idea of a cast-iron(铸铁)plow and spent his entire fortune in【S8】______his invention. The farmers,【S9】______, would have none of it, claiming that the iron poisoned the soil and made the weeds【S10】______. Nevertheless, many people devoted their attention to the plow, until in 1869 James Oliver of South Bend, Indiana, turned out the first chilled steel(冷轧)plow.

A)introducing                                                     I)exception
B)advances                                                        J)abundant
C)however                                                         K)thus
D)working                                                         L)most
E)grow                                                            M)scarce
F)equipment                                                       N)decrease
G)land                                                            O)machinery
H)better  
【S3】
选项
答案G
解析 根据语法知识。该空应该是一个名词；语境为“这里(在美洲)目的是从劳力中获得最大的效益，因为土地很多”。据此，可以确定[G]labor(劳力)为答案。
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