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7. The word “virtually” in the passage is closest in meaning to ○Clearly
○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 121
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○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 在 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. Other, 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 highvalue 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
11 在 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 在 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 sol...
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This note was uploaded on 09/17/2013 for the course LANGUAGE 13DL208 taught by Professor Wang during the Fall '13 term at East China Normal University.
- Fall '13