文勇的新托福黄金&ccedil

Sentence in the

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Unformatted text preview: ution, as new strains of drought­resistant 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 mid­twentieth century. 12 在 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—6 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 122 Mail@liuwenyong.com 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 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. █ 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 are 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 drought­resistant 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 mid­twentieth century. 13在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 在 Directions: An introductory sentence for a brief summary of the passage is provided below. Comp...
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