[求助]TT GWD31-4-28 无人讨论，请指教！

Q28:

Regulations will not allow a pesticide that is toxic to humans to be used inside houses unless the pesticide will dissipate completely from the air within eight hours after its application.  One test that pesticide manufacturers standardly use to determine how quickly anti-termite pesticides dissipate involves spraying the pesticides on the walls of room-sized plywood boxes and then timing its dissipation.

Which of the following would it be most useful to know in order to evaluate whether a dissipation time of just under eight hours on the manufacturers’ test indicates that an anti-termite pesticide that is toxic to humans obeys regulations for use in houses?

1. Whether anti-termite pesticides dissipate more slowly in furnished rooms than in plywood boxes
2. Whether people who apply anti-termite pesticide standardly wear protective equipment that prevents them from being exposed to the pesticide
3. Whether people whose house is being treated with anti-termite pesticide generally know that they should remain out of their house during the hours immediately after the pesticide’s application
4. Whether there are anti-termite pesticides that are toxic to humans that, when subjected to the manufacturers’ test, dissipate completely from the air in the boxes in well under eight hours
5. Whether anti-termite pesticides that are not toxic to humans tend to take longer to dissipate than those that are toxic

为什么是E呢？我觉得是一个无关选项阿？百思不得其解

我也认为E是无关选项，

我认为正确答案应该是D，

对于生产商的测试，要是本来根本就不存在8小时挥发完的杀虫剂，则该测试就是无效的。

因此D选项（是否有8小时挥发完的杀虫剂）对于评估生产商测试是有用的。

我错了，我现在觉得答案是A。

呵呵，我分析的D有问题。我没有理解题干的意思。

提问是要评估“测试成功是否能代表杀虫剂无害”，倘若在装修好的房间中比在实验中挥发慢，则测试就无意义了，因此A是有用的。

谢谢agzero.我选的也是A，分析思路和你一样