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 the United States， 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， were not interested in 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.

    1.What is the main topic of the passage？

    （A） The need for agricultural advances to help feed a growing population

    （B） The development of safer machines demanded by the labor movement

    （C） Machinery that contributed to the agricultural revolution

    （D） New Jersey as a leader in the agricultural revolution

    2.The word "naturally" in line 3 is closest in meaning to

    （A） unsurprisingly

    （B） gradually

    （C） apparently

    （D） safely

    3. The expression "make the most of" in line 4 is closest in meaning to

    （A） get the best yield from

    （B） raise the price of

    （C） exaggerate the worth of

    （D） earn a living on

    4. Which of the following can be inferred from what Thomas Jefferson said （line 3-5）？

    （A） Europe was changing more quickly than the United States.

    （B） Europe had greater need of farm machinery than the United States did.

    （C） The United States was finally running out of good farmland.

    （D） There was a shortage of workers on United States farms.

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