The agriculture revolution in the nineteenth century【B1】______two things: the invention of labor-saving【B2】______and the develop

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问题     The agriculture revolution in the nineteenth century【B1】______two things: the invention of labor-saving【B2】______and the development of scientific agriculture. Labor-saving machinery naturally appeared first where labor was【B3】______"In Europe", said Thomas Jefferson, "the【B4】______is to make the most of their land, labor being sufficient; here it is to make the most of our labor, land being【B5】______".
    It was in America, therefore, that the great advances in nineteenth -century agricultural machinery first came. At the opening of the century, with the【B6】______of a crude plow, farmers could have carried practically all of the existing agricultural tools on their backs. By 1860, most of the machinery in use today had been【B7】______in an early form. The most important of the early
    【B8】______was the iron plow. As early as 1890 Charles Newbolt of New Jersey had been working on the idea of a cast-iron plow and spent his entire fortune in introducing his invention. The farmers, however, would home none of it, 【B9】______that the iron poisoned the soil and made the weeds grow. Nevertheless, many people devoted their attention to the plow, until 1869, James Oliver of South Bend, Indiana,【B10】______out the first chilled-steel plow.
Word Bank
A. turned B. scarce
C. machinery D. technology
E. advantage F. involved
G. abundant H. inventions
I. efficient J. exception
K. claiming L. object
M. designed N. defective
O. impatiently
【B4】

选项

答案L

解析
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