GWD逻辑，为毛我看不懂！

Xiaotongdi

Sunflowers growing in pots were placed, with their roots submerged, in the pond contaminated with radioactive elements.The sunflowers kept growing; in the process, they absorbed radioactive elements.Within twelve days, 85 percent of the radioactive elements were removed from the water, which is no less than can be accomplished with the much more expensive conventional filtration techniques.Scientists therefore propose using sunflowers for decontamination wherever there are radioactively contaminated ponds.


Which of the following, if true, points to a limitation on the applicability of the proposed method of decontamination?

1. Some plants other than sunflowers can also remove radioactive elements from water.
   
2. The water in many ponds contaminated with radioactive elements is so cold that it would kill sunflowers whose roots were submerged in it.
   
3. Sunflowers that grow with their roots submerged in water grow less well than sunflowers growing under optimal conditions on dry land.
   
4. Only species of sunflowers with large leaves can have their roots submerged in water and still keep growing.
   
5. In ponds in which the circulation of the water is artificially increased, sunflowers absorb radioactive elements far faster than they do in other ponds.
   

Answer:  B
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sorcerer

weaken题，建议lz看看lawyer的分析再做题~~~
这题说sunflower的根泡在水里，当sunflower生长时会吸收放射性元素
得出的结论是无论在哪，sunflower都能消除放射性元素的污染
这个wherever，如果lz敏感点的话就会觉得绝对化词容易被攻击
看选项
根据lawyer的相关无关判段，直接排除ACD
而E没有起到削弱作用
再看B，如果一个池子里的水太冷了，sunflower的根不能泡在里面，那sunflower就不能在那生存，自然不能消除
那的放射性污染，从而削弱了wherever这个绝对的论断

sivenhuidao1995

sorcerer 发表于 2011-4-8 23:58
weaken题，建议lz看看lawyer的分析再做题~~~这题说sunflower的根泡在水里，当sunflower生长时会吸收放射性 ...

同意！