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托福阅读句子插入题：the Ogallala Aquifer

2015-08-14 12:20:23来源：网络

　　【托福阅读题型：the Ogallala Aquifer句子插入题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之句子插入题

　　托福阅读句子插入题：the Ogallala Aquifer

　　【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.( Depletion of the Ogallala Aquifer)

　　! 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.

　　答案见下一页：

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