29. The tulu, a popular ornamental plant, does notreproduce naturally, and is only bred and sold by specialized horticulturalcompanies. Unfortunately, the tulu is easily devastated by a contagious fungalrot. The government ministry plans to reassure worried gardeners by requiringall tulu plants to be tested for fungal rot before being sold. However,infected plants less than 30 weeks old have generally not built up enoughfungal rot in their systems to be detected reliably. And many tulu plants aresold before they are 24 weeks old.

Which of the following, if performed bythe government ministry, could logically be expected to overcome the problem withtheir plan to test for the fungal rot?

(A) Releasing a general announcement that tulu plantsless than 30 weeks old cannot be effectively tested for fungal rot

(B) Requiring all tulu plants less than 30 weeks old tobe labeled as such

(C) Researching possible ways to test tulu plants lessthan 24 weeks old for fungal rot

(D) Ensuring that tulu plants not be sold before they are30 weeks old

(E) Quarantining all tulu plants from horticulturalcompanies at which any case of fungal rot has been detected until those tuluplants can be tested for fungal rot

Evaluation of a Plan

Situation There is a contagious fungal rot that devastates thetulu, a popular ornamental plant. To reassure worried gardeners, the governmentministry plans to require that tulu plants be tested for the rot before beingsold. However, many tulu plants are sold before they are 24 weeks old, yetfungal rot in plants less than 30 weeks old generally cannot be detectedreliably.

Reasoning What could the government ministry do to overcome theproblem? The problem arises from the fact thattulu plants are frequently sold before they are 24 weeks old, which is too soonfor any fungal rot that is present to have built up enough in their rootsystems to be detected. Since the goal of the testing is to ensure thatinfected tulu plants not be sold, an obvious solution would be to make surethat no plants are sold before they are old enough for fungal rot to have builtup to a detectable level. Thus, tulu plants should not be sold before they are30 weeks old.

A Releasing such an announcement would help overcome theproblem if it guaranteed that no one would buy or sell tulu plants before theplants were 30 weeks old, but it is far from certain that such an announcementwould guarantee this.

B Since some people may not be aware of the significanceof such labeling, such labeling might have very little effect.

C There is no guarantee that such research will besuccessful at reducing the age at which tulu plants can be reliably tested.

D Correct. If the government ensures that no tulu plants less than 30 weeks of age are sold,then the specific problem mentioned in the passage would be overcome.

E This will not help overcome the problem. Such aquarantine program might lead horticultural companies to start selling tuluplants only if they are less than 24 weeks old, therebyminimizing the chance of quarantine by minimizing the chance of detection.

我对E选项不理解，既然隔离了的话那不是跟D一样也不能卖么，不也是解决了问题检测上的问题么？希望各位童鞋能帮忙解释一下，谢谢！