关于新版prep 1中有2道题不是很清楚，请哪位nn帮忙指点一下~~
80. (24979-!-item-!-188;#058&001383)
In many scientific disciplines, scientists generally do not do highly creative work beyond the age of forty, a tendency that has normally been taken to show that aging carries with it a loss of creative capacity. However, by the age of forty most scientists have been working in their chosen field for at least fifteen years, so an alternative explanation is that spending too long in a single field reduces the opportunity for creative thought.
Investigating which of the following would be most useful in choosing between the competing explanations described above?
A. Whether among those scientists who do highly creative work beyond age forty a large proportion entered their field at a considerably later age than is common
B. Whether scientists' choice of research projects tends to be influenced by their own belief that their most creative work will be done relatively early in their career
C. Whether scientists who are older than forty tend to find more satisfaction in other activities, such as teaching and mentoring, than they do in pursuing their own research
D. Whether funding agencies are more inclined to award research grants to scientists who are veterans in their field than to scientists who are relative newcomers
E. Whether there is significant variation among scientific fields in the average age at which scientists working in those fields are at their most productive
正确答案是A，我在AB选项之间有些迷糊，望有大虾指点一下哈
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98. (32682-!-item-!-188;#058&006783) (GWD 28-Q29)
Early in the twentieth century,
The argument depends on assuming which of the following?
A. Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.
A. Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.
B. There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in
C. The bottom of the lake does not contain toxic remnants of earlier pollution that will be stirred into the water by pipeline construction.
D. Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.
E. The species of fish that are present in
正确答案为C，我选的是B。我现在能明白C为什么对，可是不明白B怎么错了，原文说provided this technology is effective，那么将B 取非就是There is reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in
80题说一些人认为科学家40岁以上创造性想法就不多了，也就是随着年龄增长创造性降低。但很多40岁的科学家都在自己的研究领域里研究了15年以上，所以另一种说法认为在一个领域待的时间太长会降低创造性。答案a:那些在40岁以后仍然保持高创造性的科学家当中有一大部分进入他们的研究领域的时间是少于通常认为的年限的（15年）。这个选项支持了“在一个领域待的时间太长会降低创造性”的解释。
98题是需要找一个前提来加强结论，不是削弱啊
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