12.In its early history,Chicago had floods frequently,especially in the spring,making the streets so muddy that people,horses,and carts got stuck.An old joke that was popular at the time went something like this:A man is stuck up to his waist in a muddy Chicago street.Asked if he needs help,he replies,"No,thanks.I've got a good horse under me."
The city planner decided to build an underground drainage(排水)system,but there simply wasn't enough difference between the height of the ground level and the water level.The only two options were to lower the Chicago River or raise the city.
An engineer named Ellis Chesbrough convinced me the city that it had no choice but to build the pipes above ground and then cover them with dirt.This raised the level of the city's streets by as much as 12 feet.
This of course created a new problem:dirt practically buried the first floors of every building in Chicago.Building owners were faced with a choice:either change the first floors of their buildings into basements,and the second stories into main floors,or hoist the entire buildings to meet the new street level.Small wood-frame buildings could be lifted fairly easily.But what about large,heavy structures like Tremont Hotel,which was a six-story brick building?
That's where George Pullman came in.He had developed some house-moving skills successfully.To lift a big structure like the Tremont Hotel,Pullman would place thousands of jackscrews (螺旋千斤頂) beneath the building's foundation.One man was assigned to operate each section of roughly 10 jackscrews.At Pullman's signal each man turned his jackscrew the same amount at the same time,thereby raising the building slowly and evenly.Astonishingly,the Tremont Hotel stay open during the entire operation,and many of its guests didn't even notice anything was happening.Some people like to say that every problem has a solution.But in Chicago's early history,every engineering solution seemed to create a new problem.Now that Chicago's waste water was draining efficiently into the Chicago River,the city's next step was to clean the polluted river.
28.The author mentions the joke to showB.
A.horses were fairly useful in Chicago
B.Chicago's streets were extremely muddy
C.Chicago was very dangerous in the spring
D.the Chicago people were particularly humorous
29.The underlined word"hoist"in Paragraph 4 means"B".
A.change
B.lift
C.repair
D.decorate
30.What can we conclude about the moving operation of the Tremont Hotel?A
A.It went on smoothly as intended.
B.It interrupted the business of the hotel.
C.It involved Pullman turning ten jackscrews.
D.It separated the building from its foundation.
31.The passage is mainly about the early Chicago'sC.
A.popular life styles and their influences
B.environmental disasters and their causes
C.engineering problems and their solutions
D.successful businessmen and their achievements.
分析 本文講述了芝加哥城的問題和改造方案.
解答 28.B;細節(jié)推理題.根據文章的第一段第一句話:In early history,Chicago had floors frequently,especially in the spring,making the streets so muddy that people,horses,and carts got stuck.可知芝加哥因為洪水的經常泛濫導致大街上總是泥濘不堪,行人,馬和車全部都堵在路上.所以作者提及那個玩笑是為了突出芝加哥這一特點,故選B
29.B;細節(jié)推理題.根據后文:Small wood-frame building could be lifted fairly easily.可知另一種方法就是將建筑升高.故選B
30.A;細節(jié)推理題.根據倒數第二段中的倒數第二句話:At Pullman's signal each man turned his jackscrew the same amount at the same time,thereby raising the building slowly and evenly.(在Pullman的指導下,每個人同時抬起他們手中的千斤頂,因此建筑就被慢慢地、平整地抬起來了)可知A項正確,故選A
31.C;主旨大意題.文章的第一段就提出芝加哥城所存在的問題,接下來的段落討論了解決這個問題的一些方法,最后一段講到這些方法雖然解決當前的問題,但是隨之而來的又會冒出一些新的問題有待解決.故文章大致上講述的是建造的問題與解決辦法,故選C
點評 本篇文章細節(jié)推理題,答題的已給選項一般不會和短文相關詞語完全相同,需要考生自己理解句子,延伸推理出題目答案,比一般細節(jié)理解題偏難.