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  3. California has been facing a drought for many years now, with certain areas even having to pump freshwater hundreds of miles to

California has been facing a drought for many years now, with certain areas even having to pump freshwater hundreds of miles to

admin2021-01-06  23
问题    California has been facing a drought for many years now, with certain areas even having to pump freshwater hundreds of miles to their distribution system. The problem is growing as the population of the state continues to expand. New research has found deep water reserves under the state which could help solve their drought crisis. Previous drilling of wells could only reach depths of 1,000 feet, but due to new pumping practices, water deeper than this can now be extracted (抽取). The team at Stanford investigated the aquifers (地下蓄水层) below this depth and found that reserves may be triple what was previously thought.
   It is profitable to drill to depths more than 1,000 feet for oil and gas extraction, but only recently in California has it become profitable to pump water from this depth. The aquifers range from 1,000 to 3 ,000 feet below the ground, which means that pumping will be expensive and there are other concerns. The biggest concern of pumping out water from this deep is the gradual settling down of the land surface. As the water is pumped out, the vacant space left is compacted by the weight of the earth above.    Even though pumping from these depths is expensive, it is still cheaper than desalinating (脱盐) the ocean water in the largely coastal state. Some desalination plants exist where feasible, but they are costly to run and can need constant repairs. Wells are much more reliable sources of freshwater, and California is hoping that these deep wells may be the answer to their severe water shortage.
   One problem with these sources is that the deep water also has a higher level of salt than shallower aquifers. This means that some wells may even need to undergo desalination after extraction, thus increasing the cost. Research from the exhaustive study of groundwater from over 950 drilling logs has just been published. New estimates of the water reserves now go up to 2,700 billion cubic meters of freshwater.  
What does the author say about deep wells?
选项 A、They run without any need for repairs.
B、They are entirely free from pollutants.
C、They are the ultimate solution to droughts.
D、They provide a steady supply of freshwater.
答案D
解析 推理题。原文第三段第三句指出，井水是更加可靠的淡水来源，由此可知，更加可靠意味着相对稳定，故答案为D。A、B两项原文均未提及，故排除。该句说加州只是希望这些深井能解决水资源短缺的问题，而不是干旱问题，C项属于偷换概念，故排除。
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