[求助]一道cr看不明白了

VincentFSJ

The tulu, a popular ornamental plant, does not reproduce naturally, and is only
bred and sold by specialized horticultural companies. Unfortunately, the tulu is
easily devastated by a contagious fungal rot. The government ministry plans to
reassure worried gardeners by requiring all tulu plants to be tested for fungal rot
before being sold. However, infected plants less than 30 weeks old have generally
not built up enough fungal rot in their systems to be detected reliably. And many
tulu plants are sold before they are 24 weeks old.
Which of the following, if performed by the government ministry, could logically
be expected to overcome the problem with their plan to test for the fungal rot?
(A) Releasing a general announcement that tulu plants less than 30 weeks
old cannot be effectively tested for fungal rot
(B) Requiring all tulu plants less than 30 weeks old to be labeled as such
(C) Researching possible ways to test tulu plants less than 24 weeks old for
fungal rot
(D) Ensuring that tulu plants not be sold before they are 30 weeks old
(E) Quarantining all tulu plants from horticultural companies at which any
case of fungal rot has been detected until those tulu plants can be tested for
fungal rot
拜托请看一下这个到底是什么意思，文中并没有说这个rot是一开始就可以感染这个plant的呀，为什么到plant 30 weeks old就可以测出来了？

Bug君。

tulu很容易被fungal rot破坏，因此政府希望在tulu卖出之前就进行fungal rot的检验。但是30周以下的tulu还没有足够能被检验出来的的fungal rot，而很多tulu在24周之前就被卖掉了，问你政府怎么做才能克服tulu检验的这个问题

春暖花开19

楼主这道题答案最后是选D么

VincentFSJ

Fiona09 发表于 2016-8-2 15:49
俺赶脚30 week 可以认为是fungal rot潜伏期，tulu有可能被其感染，也有可能是完好的，只有长到30 week大时 ...

好像是这样子的话，如果是这样的话应该就可以解释得过来了，谢谢啦！

Fiona09

俺赶脚30 week 可以认为是fungal rot潜伏期，tulu有可能被其感染，也有可能是完好的，只有长到30 week大时才能检测出来感染与否。