GWD 4-28, 请教了，谢谢

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