托福TPO3閱讀真題原文題目及答案Part2
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托福TPO3閱讀真題原文Part2
Depletion of the Ogallala Aquifer
The vast grasslands of the High Plains in the central United States were settled by farmers and ranchers in the 1880s. This region has a semiarid climate, and for 50 years after its settlement, it supported a low-intensity agricultural economy of cattle ranching and wheat farming. In the early twentieth century, however, it was discovered that much of the High Plains was underlain by a huge aquifer (a rock layer containing large quantities of groundwater). This aquifer was named the Ogallala aquifer after the Ogallala Sioux Indians, who once inhabited the region.
The Ogallala aquifer is a sandstone formation that underlies some 583,000 square kilometers of land extending from northwestern Texas to southern South Dakota. Water from rains and melting snows has been accumulating in the Ogallala for the past 30,000 years. Estimates indicate that the aquifer contains enough water to fill Lake Huron, but unfortunately, under the semiarid climatic conditions that presently exist in the region, rates of addition to the aquifer are minimal, amounting to about half a centimeter a year.
The first wells were drilled into the Ogallala during the drought years of the early 1930s. The ensuing rapid expansion of irrigation agriculture, especially from the 1950s onward, transformed the economy of the region. More than 100,000 wells now tap the Ogallala. Modern irrigation devices, each capable of spraying 4.5 million liters of water a day, have produced a landscape dominated by geometric patterns of circular green islands of crops. Ogallala water has enabled the High Plains region to supply significant amounts of the cotton, sorghum, wheat, and corn grown in the United States. In addition, 40 percent of American grain-fed beef cattle are fattened here.
This unprecedented development of a finite groundwater resource with an almost negligible natural recharge rate-that is, virtually no natural water source to replenish the water supply-has caused water tables in the region to fall drastically. In the 1930s, wells encountered plentiful water at a depth of about 15 meters; currently, they must be dug to depths of 45 to 60 meters or more. In places, the water table is declining at a rate of a meter a year, necessitating the periodic deepening of wells and the use of ever-more-powerful pumps. It is estimated that at current withdrawal rates, much of the aquifer will run dry within 40 years. The situation is most critical in Texas, where the climate is driest, the greatest amount of water is being pumped, and the aquifer contains the least water. It is projected that the remaining Ogallala water will, by the year 2030, support only 35 to 40 percent of the irrigated acreage in Texas that is supported in 1980.
The reaction of farmers to the inevitable depletion of the Ogallala varies. Many have been attempting to conserve water by irrigating less frequently or by switching to crops that require less water. Others, however, have adopted the philosophy that it is best to use the water while it is still economically profitable to do so and to concentrate on high-value crops such as cotton. The incentive of the farmers who wish to conserve water is reduced by their knowledge that many of their neighbors are profiting by using great amounts of water, and in the process are drawing down the entire region's water supplies.
In the face of the upcoming water supply crisis, a number of grandiose schemes have been developed to transport vast quantities of water by canal or pipeline from the Mississippi, the Missouri, or the Arkansas rivers.
Unfortunately, the cost of water obtained through any of these schemes would increase pumping costs at least tenfold, making the cost of irrigated agricultural products from the region uncompetitive on the national and international markets. Somewhat more promising have been recent experiments for releasing capillary water (water in the soil) above the water table by injecting compressed air into the ground. Even if this process proves successful, however, it would almost triple water costs. Genetic engineering also may provide a partial solution, as new strains of drought-resistant crops continue to be developed. Whatever the final answer to the water crisis may be, it is evident that within the High Plains, irrigation water will never again be the abundant, inexpensive resource it was during the agricultural boom years of the mid-twentieth century.
Paragraph 1: The vast grasslands of the High Plains in the central United States were settled by farmers and ranchers in the 1880s. This region has a semiarid climate, and for 50 years after its settlement, it supported a low-intensity agricultural economy of cattle ranching and wheat farming. In the early twentieth century, however, it was discovered that much of the High Plains was underlain by a huge aquifer (a rock layer containing large quantities of groundwater). This aquifer was named the Ogallala aquifer after the Ogallala Sioux Indians, who once inhabited the region.
托福TPO3閱讀真題題目Part2
1.According to paragraph 1, which of the following statements about the High Plains is true?
○Until farmers and ranchers settled there in the 1880s, the High Plains had never been inhabited.
○The climate of the High Plains is characterized by higher-than-average temperatures.
○The large aquifer that lies underneath the High Plains was discovered by the Ogallala Sioux Indians.
○B(yǎng)efore the early 1900s there was only a small amount of farming and ranching in the High Plains.
Paragraph 2: The Ogallala aquifer is a sandstone formation that underlies some 583,000 square kilometers of land extending from northwestern Texas to southern South Dakota. Water from rains and melting snows has been accumulating in the Ogallala for the past 30,000 years. Estimates indicate that the aquifer contains enough water to fill Lake Huron, but unfortunately, under the semiarid climatic conditions that presently exist in the region, rates of addition to the aquifer are minimal, amounting to about half a centimeter a year.
2. According to paragraph 2, all of the following statements about the Ogallala aquifer are true EXCEPT:
○The aquifer stretches from South Dakota to Texas.
○The aquifer's water comes from underground springs.
○Water has been gathering in the aquifer for 30,000 years.
○The aquifer's water is stored in a layer of sandstone.
3. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.
○Despite the current impressive size of the Ogallala aquifer, the region's climate keeps the rates of water addition very small.
○Although the aquifer has been adding water at the rate of only half a centimeter a year, it will eventually accumulate enough water of fill Lake Huron.
○B(yǎng)ecause of the region's present climatic conditions, water is being added each year to the aquifer.
○Even when the region experiences unfortunate climatic conditions, the rates of addition of water continue to increase.
Paragraph 3: The first wells were drilled into the Ogallala during the drought years of the early 1930s. The ensuing rapid expansion of irrigation agriculture, especially from the 1950s onward, transformed the economy of the region. More than 100,000 wells now tap the Ogallala. Modern irrigation devices, each capable of spraying 4.5 million liters of water a day, have produced a landscape dominated by geometric patterns of circular green islands of crops. Ogallala water has enabled the High Plains region to supply significant amounts of the cotton, sorghum, wheat, and corn grown in the United States. In addition, 40 percent of American grain-fed beef cattle are fattened here.
4. The word "ensuing" in the passage is closest in meaning to
○continuing
○surprising
○initial
○subsequent
5. In paragraph 3, why does the author provide the information that 40 percent of American cattle are fattened in the High Plains?
○To suggest that crop cultivation is not the most important part of the economy of the High Plains
○To indicate that not all economic activity in the High Plains is dependent on irrigation
○To provide another example of how water from the Ogallala has transformed the economy of the High Plains
○To contrast cattle-fattening practices in the High Plains with those used in other region of the United States
Paragraph 4: This unprecedented development of a finite groundwater resource with an almost negligible natural recharge rate-that is, virtually no natural water source to replenish the water supply-has caused water tables in the region to fall drastically. In the 1930s, wells encountered plentiful water at a depth of about 15 meters; currently, they must be dug to depths of 45 to 60 meters or more. In places, the water table is declining at a rate of a meter a year, necessitating the periodic deepening of wells and the use of ever-more-powerful pumps. It is estimated that at current withdrawal rates, much of the aquifer will run dry within 40 years. The situation is most critical in Texas, where the climate is driest, the greatest amount of water is being pumped, and the aquifer contains the least water. It is projected that the remaining Ogallala water will, by the year 2030, support only 35 to 40 percent of the irrigated acreage in Texas that is supported in 1980.
6. The word "unprecedented" in the passage is closest in meaning to
○difficult to control
○without any restriction
○unlike anything in the past
○rapidly expanding
7. The word "virtually" in the passage is closest in meaning to
○clearly
○perhaps
○frequently
○almost
8. According to paragraph 4, all of following are consequences of the heavy use of the Ogallala aquifer for irrigation EXCEPT:
○The recharge rate of the aquifer is decreasing.
○Water tables in the region are becoming increasingly lower.
○Wells now have to be dug to much greater depths than before.
○Increasingly powerful pumps are needed to draw water from the aquifer.
9. According to paragraph 4, compared with all other states that use Ogallala water for irrigation, Texas
○has the greatest amount of farmland being irrigated with Ogallala water
○contains the largest amount of Ogallala water underneath the soil
○is expected to face the worst water supply crisis as the Ogallala runs dry
○uses the least amount of Ogallala water for its irrigation needs
Paragraph 5: The reaction of farmers to the inevitable depletion of the Ogallala varies. Many have been attempting to conserve water by irrigating less frequently or by switching to crops that require less water. Others, however, have adopted the philosophy that it is best to use the water while it is still economically profitable to do so and to concentrate on high-value crops such as cotton. The incentive of the farmers who wish to conserve water is reduced by their knowledge that many of their neighbors are profiting by using great amounts of water, and in the process are drawing down the entire region's water supplies.
10. The word "inevitable" in the passage is closest in meaning to
○unfortunate
○predictable
○unavoidable
○final
11. Paragraph 5 mentions which of the following as a source of difficulty for some farmers who try to conserve water?
○Crops that do not need much water are difficult to grow in the High Plains.
○Farmers who grow crops that need a lot of water make higher profits.
○Irrigating less frequently often leads to crop failure.
○Few farmers are convinced that the aquifer will eventually run dry.
Paragraph 6: In the face of the upcoming water supply crisis, a number of grandiose schemes have been developed to transport vast quantities of water by canal or pipeline from the Mississippi, the Missouri, or the Arkansas rivers. Unfortunately, the cost of water obtained through any of these schemes would increase pumping costs at least tenfold, making the cost of irrigated agricultural products from the region uncompetitive on the national and international markets. Somewhat more promising have been recent experiments for releasing capillary water (water in the soil) above the water table by injecting compressed air into the ground. Even if this process proves successful, however, it would almost triple water costs. Genetic engineering also may provide a partial solution, as new strains of drought-resistant crops continue to be developed. Whatever the final answer to the water crisis may be, it is evident that within the High Plains, irrigation water will never again be the abundant, inexpensive resource it was during the agricultural boom years of the mid-twentieth century.
12.According to paragraph 6, what is the main disadvantage of the proposed plans to transport river water to the High Plains?
○The rivers cannot supply sufficient water for the farmer's needs.
○Increased irrigation costs would make the products too expensive.
○The costs of using capillary water for irrigation will increase.
○Farmers will be forced to switch to genetically engineered crops.
Paragraph 5: The reaction of farmers to the inevitable depletion of the Ogallala varies. Many have been attempting to conserve water by irrigating less frequently or by switching to crops that require less water. █Others, however, have adopted the philosophy that it is best to use the water while it is still economically profitable to do so and to concentrate on high-value crops such as cotton. █The incentive of the farmers who wish to conserve water is reduced by their knowledge that many of their neighbors are profiting by using great amounts of water, and in the process are drawing down the entire region's water supplies. █
Paragraph 6: In the face of the upcoming water supply crisis, a number of grandiose schemes have been developed to transport vast quantities of water by canal or pipeline from the Mississippi, the Missouri, or the Arkansas rivers. █Unfortunately, the cost of water obtained through any of these schemes would increase pumping costs at least tenfold, making the cost of irrigated agricultural products from the region uncompetitive on the national and international markets. Somewhat more promising have been recent experiments for releasing capillary water (water in the soil) above the water table by injecting compressed air into the ground. Even if this process proves successful, however, it would almost triple water costs. Genetic engineering also may provide a partial solution, as new strains of drought-resistant crops continue to be developed. Whatever the final answer to the water crisis may be, it is evident that within the High Plains, irrigation water will never again be the abundant, inexpensive resource it was during the agricultural boom years of the mid-twentieth century.
13.Look at the four squares [█] that indicate where the following sentence could be added to the passage
But even if uncooperative farmers were to join in the conservation efforts, this would only delay the depletion of the aquifer.
Where would the sentence best fit? Click on a square to add the sentence to the passage.
14.Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.
The Ogallala aquifer is a large underground source of water in the High Plains region of the United States.
●
●
●
Answer choices
○The use of the Ogallala for irrigation has allowed the High Plains to become one of the most productive agricultural regions in the United States.
○Given the aquifer's low recharge rate, its use for irrigation is causing water tables to drop and will eventually lead to its depletion.
○Releasing capillary water and introducing drought-resistant crops are less-promising solutions to the water supply crisis than bringing in river water
○The periodic deepening of wells and the use of more-powerful pumps would help increase the natural recharge rate of the Ogallala.
○In Texas, a great deal of attention is being paid to genetic engineering because it is there that the most critical situation exists.
○Several solutions to the upcoming water supply crisis have been proposed, but none of them promises to keep the costs of irrigation low.
托福TPO3閱讀真題答案Part2
參考答案：
1. ○4
2. ○2
3. ○1
4. ○4
5. ○3
6. ○3
7. ○4
8. ○1
9. ○3
10. ○3
11. ○2
12. ○2
13. ○3
14. The use of the Ogallala for…
Given the aquifer's low recharge…
Several solutions to the upcoming…
托福TPO3閱讀翻譯Part2
奧加拉拉蓄水層的枯竭
19世紀80年代，在美國中部北美大平原的廣闊草原上定居著農(nóng)場主們和牧場主們。這里有著半干旱的氣候，在人們定居50年后，它支撐了一個以畜牧業(yè)和小麥種植為主的低密度農(nóng)業(yè)經(jīng)濟。然而，在20世紀初，人們發(fā)現(xiàn)北美大平原的大部地下是巨大的蓄水層(含有大量地下水的巖層)。這個蓄水層因曾經(jīng)在這里定居過的奧加拉拉蘇族印第安人而得名，被稱作奧加拉拉蓄水層。
奧加拉拉蓄水層屬于砂巖結(jié)構(gòu)，在從德克薩斯州西北到南達科塔州南部的地下綿延了58.3萬平方公里。雨水和融雪自3萬年前便開始在奧加拉拉蓄積。據(jù)估計，奧加拉拉蓄水層的含水量足以填滿休倫湖，但不幸的是，在目前該地區(qū)半干旱的氣候條件下，奧加拉拉蓄水層的蓄水能力極低，每年僅半厘米左右。
20世紀30年代初，奧加拉拉正處于干旱時期，人們打出了第一口井。灌溉農(nóng)業(yè)的迅速擴張，特別是20世紀50年代之后，改變了這一地區(qū)的經(jīng)濟。目前人們已經(jīng)在奧加拉拉地區(qū)共開鑿了10萬多口井。日噴水量達到450萬升的現(xiàn)代灌溉設(shè)備，形成了一個圓形綠島作物為主的景觀。奧加拉拉蓄水層支撐了北美大平原地區(qū)棉花、高粱、小麥、玉米的灌溉需求。此外，美國40%谷飼養(yǎng)的肉牛在這里被育肥。
考慮到幾乎沒有補充率(實質(zhì)上沒有自然水資源進行補充)，這種有限地下水資源前所未有的發(fā)展已經(jīng)引起了該地區(qū)地下水位的急劇下降。在20世紀30年代，井下15米就有豐富的水資源，而現(xiàn)在，必須挖掘到45米到60米甚至更深的地方才行。有的地方地下水位的下降速度甚至達到了每年1米，迫使人們周期性的加深水井并使用更有力的水泵。按現(xiàn)今的下降速度來估計，大部分地下蓄水將在40年內(nèi)耗盡。這種現(xiàn)象在氣候最干旱的德克薩斯州尤為嚴重。大量的水被從地下抽起，蓄水層含水量最少。據(jù)估計，到2030年，德克薩斯州余下的奧加拉拉含水只能支持1980年灌溉面積的35%到40%。
農(nóng)場主們對無法避免的奧加拉拉蓄水層枯竭的反應(yīng)各不相同。很多人已經(jīng)開始嘗試通過降低灌溉頻率或者改種需水較少的莊稼來節(jié)約水資源。而另外一些人卻抱著趁水資源還能產(chǎn)生經(jīng)濟效益就應(yīng)抓緊利用的想法，繼續(xù)種植高價值的棉花等農(nóng)作物。當那些想節(jié)水的農(nóng)場主得知鄰居們通過大量耗水的種植而盈利的時候，他們的熱情降低了，從而導(dǎo)致了整個區(qū)域的供水量的減少。
在即將到來的水資源供應(yīng)危機面前，人們提出了一些宏偉的供水計劃，比如將密西西比河、密蘇里河或者阿肯色河的水通過運河或管道運到需要用水的地方。不幸的是，通過以上任何一種方式獲得水資源都會將抽水的成本提高10倍以上，進而導(dǎo)致這一地區(qū)的灌溉農(nóng)產(chǎn)品成本在國內(nèi)和國際市場上失去競爭力。最近一些有希望獲得成功的試驗試圖通過向土壤中注入壓力，釋放水層上方土壤中的毛細管水。即使這樣行之有效，抽水成本會變到原來的3倍?；蚬こ桃矔ㄟ^繼續(xù)研發(fā)抗旱作物新品種，幫助解決部分難題。無論這次水資源危機的最終結(jié)果如何，顯然，北美大平原地區(qū)灌溉水資源再也不會像20世紀中期農(nóng)業(yè)繁榮時期的那樣充足并且廉價了。
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托福TPO3閱讀真題原文題目及答案Part2
