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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 ministry, could logically be expected to overcome the problem with their plan to test for the fungal rot?

正确答案: D

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发表于 2013-11-8 14:33:53 | 显示全部楼层
tutu后面有修饰语all tulu plants from horticultural companies , horticultural companies 不等于全部tulu吧,所以没有办法隔离全部?
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