Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lake’s waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again. However, a technology for preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless.
The argument depends on assuming which of the following?
A. Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.
B. There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa.
C. The bottom of the lake does not contain toxic remnants of earlier pollution that will be stirred into the water by pipeline construction.
D. Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.
E. The species of fish that are present in Lake Konfa now are the same as those that were in the lake before it was affected by pollution.
为什么选c不选b作者: 指弹之水 时间: 2012-2-24 21:26
Therefore, provided this technology is effective
题目说了作者: starry1008 时间: 2012-2-25 16:24
结论是因为 provided this technology is effective, 所以those fears are groundless
从问题看，assumption型的题无非是排除它因和填补gap。从题干看，明显这题的题干是有gap的。
选项B说：没有理由去相信这个technology是无效的，因为……
这里，一没有排除它因，二没有填补gap，只是重复了原因。
而C排除了它因：湖底没有有毒的物质。
所以C是对的，而B应该是个无关选项。
个人意见，仅供参考……作者: sogapink 时间: 2012-2-25 16:25
同问a作者: lightseekerS 时间: 2012-2-26 07:18
明白了 多谢多谢
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