托福TPO答案解析汇总(全)!托福TPO的每套题中,都完整的包含了听说读写四部分的内容,是大家模拟练习的最佳资料,为了辅助大家更好地练习,小编也整理了TPO资料对应的答案解析,帮助大家更好地来备考托福考试。

  The Commercialization of Lumber

  In nineteenth-century America, practically everything that was built involved wood.Pine was especially attractive for building purposes.It is durable and strong, yet soft enough to be easily worked with even the simplest of hand tools.It also floats nicely on water, which allowed it to be transported to distant markets across the nation.The central and northern reaches of the Great Lakes states—Michigan, Wisconsin, and Minnesota—all contained extensive pine forests as well as many large rivers for floating logs into the Great Lakes, from where they were transported nationwide.

  By 1860, the settlement of the American West along with timber shortages in the East converged with ever-widening impact on the pine forests of the Great Lakes states. Over the next 30 years, lumbering became a full-fledged enterprise in Michigan, Wisconsin, and Minnesota. Newly formed lumbering corporations bought up huge tracts of pineland and set about systematically cutting the trees. Both the colonists and the later industrialists saw timber as a commodity, but the latter group adopted a far more thorough and calculating approach to removing trees. In this sense, what happened between 1860 and 1890 represented a significant break with the past. No longer were farmers in search of extra income the main source for shingles, firewood, and other wood products. By the 1870s, farmers and city dwellers alike purchased forest products from large manufacturing companies located in the Great Lakes states rather than chopping wood themselves or buying it locally.

  The commercialization of lumbering was in part the product of technological change. The early, thick saw blades tended to waste a large quantity of wood, with perhaps as much as a third of the log left behind on the floor as sawdust or scrap. In the 1870s, however, the British-invented band saw, with its thinner blade, became standard issue in the Great Lakes states' lumber factories.Meanwhile, the rise of steam-powered mills streamlined production by allowing for the more efficient, centralized, and continuous cutting of lumber. Steam helped to automate a variety of tasks, from cutting to the carrying away of waste. Mills also employed steam to heat log ponds, preventing them from freezing and making possible year-round lumber production.

  For industrial lumbering to succeed, a way had to be found to neutralize the effects of the seasons on production. Traditionally, cutting took place in the winter, when snow and ice made it easier to drag logs on sleds or sleighs to the banks of streams. Once the streams and lakes thawed, workers rafted the logs to mills, where they were cut into lumber in the summer. If nature did not cooperate—if the winter proved dry and warm, if the spring thaw was delayed—production would suffer. To counter the effects of climate on lumber production, loggers experimented with a variety of techniques for transporting trees out of the woods. In the 1870s, loggers in the Great Lakes states began sprinkling water on sleigh roads, giving them an artificial ice coating to facilitate travel. The ice reduced the friction and allowed workers to move larger and heavier loads.

  But all the sprinkling in the world would not save a logger from the threat of a warm winter. Without snow the sleigh roads turned to mud. In the 1870s, a set of snowless winters left lumber companies to ponder ways of liberating themselves from the seasons. Railroads were one possibility.At first, the remoteness of the pine forests discouraged common carriers from laying track.But increasing lumber prices in the late 1870s combined with periodic warm, dry winters compelled loggers to turn to iron rails. By 1887, 89 logging railroads crisscrossed Michigan, transforming logging from a winter activity into a year-round one.

  Once the logs arrived at a river, the trip downstream to a mill could be a long and tortuous one.Logjams (buildups of logs that prevent logs from moving downstream) were common—at times stretching for 10 miles—and became even more frequent as pressure on the northern Midwest pinelands increased in the 1860s. To help keep the logs moving efficiently, barriers called booms (essentially a chain of floating logs) were constructed to control the direction of the timber. By the 1870s, lumber companies existed in all the major logging areas of the northern Midwest.

  1.The word "durable" in the passage is closest in meaning to

  A. readily available

  B. long lasting

  C. dense

  D. flexible

  正确答案:B

  题目解析:

  本题为词汇题。“durable”的意思是“持久的,耐用的”,词汇所在句子“It is durable and strong, yet soft enough to be easily worked with even the simplest of hand tools.”的意思是“它耐用而坚固,却又足够软到即使最简单的手工工具也能轻易工作。” A选项:readily available意思是“一应俱全, 随手可得”,排除。 B选项:long lasting意思是“长久的,持久的”,意思最为贴近,故为正确答案。 C选项:dense意思是“稠密的”,排除。 D选项:flexible的意思是“灵活的”,排除。

  2.According to paragraph 1, all of the following characteristics of pine made it a desirable material for building in nineteenth-century America EXCEPT:

  A. It was long lasting.

  B. It was relatively easy to transport.

  C. Its softness made it easy to work with.

  D. It produced buildings that were especially attractive.

  正确答案:D

  题目解析:

  本题为否定事实信息题。重点不能漏看EXCEPT,选的是文中未提及项。根据题干中的定位词“desirable”我们定位到文中这句话“Pine was especially attractive for building purposes.”而这句话之后的内容暗示了是本题的关键信息,“It is durable and strong, yet soft enough to be easily worked with even the simplest of hand tools. It also floats nicely on water, which allowed it to be transported to distant markets across the nation.”从句子中提到的信息来排除选项。 A选项:It was long lasting,对应durable,所以排除 B选项:It was relatively easy to transport,对应 floats nicely on water,可得知由水路运输相对便捷,所以也排除 C选项:Its softness made it easy to work with,对应了 easily worked,排除 D选项:It produced buildings that were especially attractive,意思是“用松木建造的建筑十分有吸引力”同样的attractive一词混淆原文中的“松木在建筑用途上十分受欢迎”,曲解原意,故D为答案。

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