单选题The agriculture 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 sufficient; 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 (粗糙的) 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 designed in an early form. The most important of the early inventions 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 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 1896, James Oliver of South Bend, Indiana, turned out the first chilled-steel plow.

单选题George: I have just gotten a pair of movie tickets and was thinking of inviting you. Are you interested? Heather: Yeah, definitely! ______ George: No problem.

单选题Have you any other reasons ______ the ones you just mentioned above?

单选题For John this was the beginning of a new life, _____he thought he would never see,

单选题The government cannot operate effectively ______ it is free from such interference. A. so long as B. so that C. unless D. because

单选题Having been found guilty, the man was given a severe ______ by the judge.

单选题Many people complain of the rapid ______ of modern life.

单选题Dad: Could you run over to the store right away? We need a few things. Son: ______

单选题The reason ______ he forgot the time ______ we had appointed doesn't sound very believable. A. why; when B. that; when C. which; which D. that; that

单选题I enjoyed the concert last night; they played ______ beautiful music. A. such B. such a C. so D. so a

单选题I don"t like talking on ______ telephone; I prefer writing ______ letters.

单选题______ mostly in small town, I'd only recently fallen in love with cities.

单选题The chairman proposed that (every speaker) (must) limit (himself) (to) fifteen minutes.

单选题The outcome of the football match was not as what we had_________ .

单选题In no way __________ .

单选题George sold most of his belongings. He had scarcely ______ left in his house.

单选题The factory operated ______ until the order was filled.

单选题No one imagined that the apparently ______ businessman was really a criminal. A. respectful B. respective C. respectable D. respecting

单选题______ the traffic jam, we would have caught our train.