Question ID:PT92 S1 Q6 Passage:In a counterattack on the harmful effects of acid rain, wildlife experts are adding lime to the water of some lakes.  "Liming" neutralizes the acid and thus staves off some damage caused by acid rain and restores the health of some lakes where life has already been harmed by acidification.  Lakes in which lime is used must be treated periodically because their water is constantly being replaced, carrying away the lime.  If a lake's water is replaced more often than once every six months, it is not a candidate for liming because of the cost. Stem:If all the statements above are true, each of the following must also be true EXCEPT: Correct Answer Choice:CChoice A:If a lake is a candidate for liming, its water is replaced every six months or less often. Choice B:In some lakes, if liming is to be successful over the long term in counteracting the harmful effects of acid rain, liming must be repeated at intervals. Choice C:Unlimed lakes in which the water is replaced frequently are less likely to be harmed by acid rain than those lakes in which the water is replaced infrequently. Choice D:Liming can be effective even if it is used after some life in a lake has been killed by acid rain. Choice E:If a lake's water is replaced frequently, it may not be economical to attack the effects of acid rain there by liming.