GWD 2 Q19

[xenophen]

Q19:
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?

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


好像都沒人問這堤ㄟ
GWD附的答案裡也沒有這題
想請問不知道大家覺得答案是什麼?
我選B

謝謝~

[liwuu]

不知你選b的理由為何?!掃了一下,我也投b一票

[adonais]

我在B 與D掙扎了一下, 但最後投B一票, 因pond的水溫限制sunflower的生長, 使其無法發揮效用所以與題目問的limitation相符
參考一下個人拙見啦

[Calvin]

同意B

理由同adonais同學

[sleek]

I AGREE WITH YOU GUYS -- "B"

[vivid]

請問大家是如何排除c的
我怎麼覺得c也可以
謝謝

[raikennon]

小小看法請參考
科學家假設sunflower可以消除污染
題目要否定
(C)只有表示他在地上長的比在水中好
但沒有點出他根本就沒有辦法decontamination
所以沒有B好
參考看看

[chrissie]

我在B 與D掙扎了一下, 但最後投B一票, 因pond的水溫限制sunflower的生長, 使其無法發揮效用所以與題目問的limitation相符

我有點不太了解一個地方,如果pond的水溫限制sunflower的生長,為什麼還會達到題目所說的85%都被清除呢?
謝謝回答
參考一下個人拙見啦

[nexxt0722]

原文說:經實驗證明sunflower能清除85%的汙染,所以科學家提議就採用sunflower來減少污染

題目說:下面哪個情況為真的話,會限制"被提出用來減少污染的方法"(也就是利用sufflower)的效能?

答案A:過低的水溫限制sunflower的生長-->sunflower生長受限,減少污染的效果也就打折扣