- 某班级承诺，只要全班同学都在承诺书上签字，那么，如果全班有一人作弊，全班同学的考试成绩都以不及格计。校方接受并实施了该班的这一承诺。结果班上还是有人作弊，但班长的考试成绩是优秀。以下哪项是从上述断定逻辑地得出的结论?
- 雄性园丁鸟构筑装饰精美的巢。同一种类的不同园丁鸟群建筑的巢，具有不同的建筑和装饰风格。根据这一事实，研究人员认为园丁鸟的建筑风格是一种后天习得的，而不是先天遗传的特性。以下哪项为真，则最有助于加强研究者的结论?
- 业余兼课是高校教师的实际收入的一个重要来源。某校的一项统计表明，法律系教师的人均业余兼课的周时数是3.5，而会计系则为1.8.因此，该校法律系教师的当前人均实际收入要高于会计系。以下哪项为真，将削弱上述论证?Ⅰ。会计系教师的兼课课时费一般要高于法律系。Ⅱ。会计系教师中当兼职会计的占35%;法律系教师中当兼职律师的占20%。Ⅲ。会计系教师中业余兼课的占48%;法律系教师中业余兼课的只占20%。
- 一项调查表明，一些技术类期刊每一份杂志平均有5到6个读者。由此可以推断，在《小说月报》10000订户的背后约有50000到60000个读者。上述估算的前提是：
- 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_____.
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