托福閱讀真題Official 54 Passage 1（三）

托福閱讀真題Official 54 Passage 1（三）

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.

5.Why does the author discuss the British-invented band saw?

A.To give an example of how steam power led to technological advancements

B.To help explain how the thickness of a saw blade determines how much wood is wasted

C.To explain how competition with other countries benefited the American lumber industry

D.To illustrate the impact of new technology on the lumber industry

正確答案：D

題目詳解

題型分類(lèi)：修辭目的題

題干分析：考察句子之間的關(guān)系。

選項(xiàng)分析：

原句說(shuō)在the 1870s，然而，英國(guó)發(fā)明的帶鋸條，它有著更細(xì)的縫刃，成為五大湖伐木業(yè)的標(biāo)配。而原句前一句說(shuō)到了thick saw blades的壞處，這兩句對(duì)比一起證明第一句的觀點(diǎn)即伐木商業(yè)化部分是技術(shù)變革引起的；the product of technological change對(duì)應(yīng)D選項(xiàng)the impact of new technology。

A選項(xiàng)，British-invented band saw和steam power是獨(dú)立的兩項(xiàng)發(fā)明，兩者無(wú)關(guān)。

B選項(xiàng)，定位句沒(méi)有提到薄刃鋸浪費(fèi)了多少木頭，所以the thickness of a saw blade determines how much wood is wasted無(wú)中生有。

C選項(xiàng)，competition with other countries第三段沒(méi)有提到。

6.The phrase“allowing for”in the passage is closest in meaning to

A.encouraging

B.introducing

C.making possible

D.emphasizing

正確答案：C

題目詳解

題型分類(lèi)：詞匯題

選項(xiàng)分析：

原句為蒸汽驅(qū)動(dòng)的磨粉機(jī)使生產(chǎn)流水線(xiàn)化by allowing for更高效，更中心化和更連續(xù)地砍伐木材。making possible“使可能”符合語(yǔ)境，C選項(xiàng)正確。

A選項(xiàng)：encourage：鼓勵(lì)；

B選項(xiàng)：introduce：介紹；

D選項(xiàng)：emphasize：強(qiáng)調(diào)。

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