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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 scarce. "In Europe," said Thomas Jefferson, "the object is to make the most of their land, labor being abundant; here it is to make the most of our labor, land being abundant. " It was in America, therefore, that the great advances in nineteenth century agricultural machinery first came.
    At the opening of the century, with the exception of a crude plow, farmers could have carried practically all of the existing agricultural implements on their backs; by 1860, most of the machinery 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 working on the idea of a cast-iron plow and spent his entire fortune in introducing his invention. The farmers, however, would have none of it, claiming that the iron poisoned the soil and made the weeds grow. Nevertheless, many people devoted their attention to the plow, until in 1869 James Oliver of South Bend, Indiana, turned out the first chilled-steel plow.
What is the main topic of the passage?
选项 A、The agricultural revolution in New Jersey.
B、Machinery that contributed to the agricultural revolution.
C、The development of safer farm machines.
D、The need for agricultural advances.
答案B
解析 本题问本文的主题是什么。通读全文，我们可以总结归纳出本文的中心主题应是有关引起农业革命的农具器械问题。因此，本题的正确答案是B。
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