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题库 / GMATLA-CR-5
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?
Some plants other than sunflowers can also remove radioactive elements from water.
The water in many ponds contaminated with radioactive elements is so cold that it would kill sunflowers whose roots were submerged in it.
Sunflowers that grow with their roots submerged in water grow less well than sunflowers growing under optimal conditions on dry land.
Only species of sunflowers with large leaves can have their roots submerged in water and still keep growing.
In ponds in which the circulation of the water is artificially increased, sunflowers absorb radioactive elements far faster than they do in other ponds.
P太阳花放在污染的池塘里可以削弱污染
C用太阳花来削弱池塘污染。
方案类型的要涉及方案，B太阳花在池塘的冷水长不了。就是在说方案的可操作性。
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