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题库 / GMATAdvanced-CR-47
Letter to the editor: If the water level in the Searle River Delta continues to drop, the rising sea level will make the water saltier and less suitable for drinking. Currently, 40 percent of the water from upstream tributaries is diverted to neighboring areas. To keep the delta’s water level from dropping any further, we should end all current diversions from the upstream tributaries.
Neighboring water utilities are likely to see higher costs and diminished water supplies, but these costs are necessary to preserve the delta.
Which of the following would, if true, indicate a serious potential weakness of the suggested plan of action?
Desalination equipment would allow water from the delta to be used for drinking even it if became saltier.
Water level is only one factor that affects salinity in the delta.
The upstream tributaries’ water levels are controlled by systems of dams and reservoirs.
Neighboring areas have grown in population since the water was first diverted from upstream tributaries.
Much of the recent drop in the delta’s water level can be attributed to a prolonged drought that has recently ended.
他因
conclusion 不能分水了 目的是增加可喝水
premise 水平面下降导致水不能喝
他因 不是分流导致水平面下降 而是干旱导致
方案根本没必要实施
E gives a valid reason to doubt the proposed plan of action. If the water level drop was due to draught, and if draught has recently ended, we need not worry about water level further.
题型：a serious potential weakness 削弱题 （削弱plan，也就是削弱题+目标管理题）
削弱方法：他因削弱/ 拆桥削弱/ 不具有可行性、实行起来没有效果、有副作用（目标管理的削弱）
plan方案: end all current diversions from the upstream tributaries.--终止上流直流的分流
goal目标: not stop the 【dropping water level of Delta 】--水位不下降
E. 最相关
Much of the recent 【drop in the delta’s water level 目标 】can be attributed to 【a prolonged drought 他因】 that has recently ended.
水位下降是因为刚刚结束的干旱--（他因削弱）
根本就不需要实施，这是方案自身的问题，已经不需要担心这个起因了
另有他因 方案无效果 不一定答案一定有方案内容
方案不可行 方案副作用 方案达不成目标：其他原因导致的
找他因
建议：不让水转向邻居；结论/目的：我们的水位不会降低
reasoning：水位降低并不是因为水转向，而是因为最近的干旱。你不让水转向，水位也不会升起来。
cr
be attributed to 由于
attribute to 归因于
recently ended，那么就不用实施任何措施
that has recently ended.
太粗心了....