- 某学校有四名外国专家，分别来自美国、加拿大、韩国和日本。他们分别在电子、机械和生物三个系工作，其中：①日本专家单独在机械系;②韩国专家不在电子系;③美国专家和另外某个外国专家同在某个系;④加拿大专家不和美国专家同在一个系。以上条件可以推出美国专家所在的系为
- The agricultural revolution in the 19th century involved two things ：the invention of labor-saving machinery and the deyelopment 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 19th century agricultural machinery first came.At the opening of the century ，with the exception of a crude plow farmers could have carried pracically all of the existing agricultural implements on their backs ;by1860，most of the machinery inuse 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 introdueing 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-still 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 expression “make the most of ” in Line 4is closest in meaning to which of the following ?a.get the best yield from b.raise the price of c.make full use of d.earn a living on3. Which of the following can be inferred from what Thomas Jefferson said ?a.Europe was changing more quickly than America.b.Europe had greater need of farm machinery than America did.c.America was finally rnning out of good farmland.d.There was a shortage of workers on American farm.4. It can be inferred that the waord “here”in Line 4 refers to_____.a.Europeb.Americac.New Jerseyd.Indiana5.What point is the autor making by stating that farmers could carry nearly all their tools on their backs?a.Farmers had few tools before the agricultural revolutionb.Americans were traditionally self-reliant.c.Life on the farm was extremely difficult.d.New tools were designed to be portable.
- The teacher gave_____the examination paper.
- He‘s working hard_____.
- Two-thirds of his property_____lost in the fire.
- Both of my brothers are now married ，so I have two_____.
- The driver pulled_____at the traffic lights.
- Your bike needs_____.You ‘d better do i right now.
- _____you understand this rule ，you‘ll have no difficulty in dealing with such problems.
- “It was very cold testerday. ”“_____.”
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