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实际上,所有租金管理政策都规定了一个房东可向房客索要的最高租金。租金管理的基本原理是在对房子的需求增加而房子的供给有限致使租金急剧增加的情况下,来保护房客的利益。然而,尽管租金管理从短期来看能帮助某些房客,但是从长期来看它会对出租房屋市场造成负面影响,这是因为房东将会不情愿维持他们现有房产的质量,甚至更不愿意额外再建一些供出租的房子。 下面哪项如果正确,能最好地解释上面描述的房东的不情愿行为

A. 房客喜欢租金管理下的低质量住宿设施,而不喜欢没有租金管理下的高质量的住宿设施。
B. 租金管理使房东很难从维护或建筑新房的任何投资中取得公正合理的收益。
C. 租金管理是一种常见的习惯做法,尽管它对缓和租房紧张毫无作用。
D. 租金管理一般是由于政治原因而被引进的,因此它需要政治行为来解除它。

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警察局的统计数字显示汽车防盗装置降低了汽车被盗的危险性,但是汽车保险业对被盗汽车的统计研究则声称装备了防盗装置的汽车反而比那些没装防盗装置的汽车更有可能被偷。 下面哪项如果正确,最能解释上述矛盾

A. 被盗汽车的失主几乎总是在案发以后立即向警察局报告失窃事件,但是却倾向于延缓通知他们的保险公司,他们希望他们丢失的车能被找回来。
B. 大多数被盗的汽车都没装备汽车防盗装置,而大多数装备了汽车防盗装置的汽车都没被盗。
C. 最常见的汽车防盗装置是可听得见的报警器,这些报警器对每一起实际的试图偷车事件通常发出10个虚假的警报。
D. 那些最有可能给他们的汽车装备防盗系统的人都是汽车特别容易被盗的人,且都居住在汽车被盗事件发生率最高的地方。

尽管是航空业萧条的时期,各家航空公司也没有节省广告宣传的开支。翻开许多城市的晚报,最近一直都在连续刊登如下广告:飞机远比汽车安全!你不要被空难的夸张报道吓破了胆,根据航空业协会的统计,飞机每飞行1亿公里死1人,而汽车每走5000万公里死1人。汽车工业协会对这个广告大为恼火,他们通过电视公布了另外一个数字:飞机每飞行20万小时死1人,而汽车每行驶200万小时死1人。 如果以上资料均为真,则以下哪项最能解释上述这种看起来矛盾的结论

A. 安全性只是人们在进行交通工具选择时所考虑问题的一个方面,便利性、舒适感以及某种特殊的体验都会影响消费者的选择。
B. 尽管飞机的驾驶员所受的专业训练远远超过汽车司机,但是,因为飞行高度的原因,飞机失事的生还率低于车祸。
C. 飞机的确比汽车安全,但是,空难事故所造成的新闻轰动要远远超过车祸,所以给人们留下的印象也格外深刻。
D. 两种速度完全不同的交通工具,用运行的距离作单位来比较安全性是不全面的,用运行的时间来比较也会出偏差。

西双版纳植物园种有两种樱草,一种是自花授粉,另一种是非白花授粉,即须依靠昆虫授粉。近几年来,授粉昆虫的数量显著减少。另外,一株非白花授粉的樱草所结的种子比自花授粉的要少。显然,非自花授粉樱草的繁殖条件比自花授粉的要差。但是游人在植物园多见的是非自花授粉樱草而不是自花授粉樱草。 以上哪项判定最无助于解释上述现象

A. 和白花授粉樱草相比,非自花授粉的种子发芽率较高。
B. 非自花授粉樱草是本地植物,而自花授粉樱草是几年前从国外引进的。
C. 前几年,上述植物园非白花授粉樱草和自花授粉樱草数量比大约是5:1。
D. 在上述植物园中,为保护授粉昆虫免受游客伤害,非自花授粉樱草多种植于园林深处。

This is the 12th book of poems in about 50 years of writing by a great Northern Irish poet who is now in his eighth decade, and who recently recovered from a serious illness. Ageing and that brush with death have profoundly marked this new collection by Seamus Heaney. The change has stripped the poetry back to spare concentration on the small things of life—an old suit, the filling of a fountain pen, the hug that didn’t happen—which then open up to ever fuller significance, the more closely they are examined. It has also made the poems easier to engage with: there are no puzzling Ulsterisms, for instance. Complications have been tossed aside. Words are no longer delved into for their etymological significance as they were in the 1970s. Now they are caressed for their mellifluousness. The collection feels personal—as if it had a compelling need to be written. A decade and a half ago Mr. Heaney told The Economist that once the evil banalities of sectarianism seemed to be receding, his verse was able to admit the "big words" with which poetry had once abounded, soul and spirit, for example. In this collection both are present, at some level. The words describing a simple act—the passing of meal in sacks by aid workers onto a trailer—in the title poem, "Human Chain", transform this 12-line poem into a kind of parable. There is the collective, shared human burden of the act itself—the "stoop and drag and drain" of the heavy lifting—and then there is the wonderful letting go: "Nothing surpassed/That quick unburdening." Is the poet talking about the toil of life, and the aftermath of that toil The poems snatch precious remembered moments. They linger over the sweetness of particulars—vetch, the feel of an eel on a line. They pay attention to the heightened ritual of everyday things. The lines are short but move at a gentle pace and need to be read slowly, as the verse drifts back and forth over its country setting like a long-legged fly on a stream. Above all, and this is an odd thing to say of words on a page, the book feels like handcrafted work. Time and again Mr. Heaney returns to the image of the pen. He began his long career writing of such a pen, nestling snug as a gun between finger and thumb. The gun, we hope, is history. The pen still nestles, fruitfully. It can be revealed from the passage that the poet is a(n) ______ person.

A. knowledgeable
B. determined
C. patriotic
D. optimistic

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