请教2道逻辑题，是费允杰的题型总纲中的：
No botanist lives long enough to study the complete life cycle of an individual California redwood tree. Nevertheless, by observing many trees at different stages, botanists can piece together the evolution of a single tree. Exactly the same principle applies in astronomy to the study of the life story of globular clusters, huge spherical aggregation of about a millions stars all swarming about each other.
Which of the following is an assumption made in the passage above?
(A) The methods of scientists in one field generally carry over to other field even if the subject matter is vastly different.
(B)Observations of the life cycle of a single individual have little value in scientific studies.
(C)Globular clusters at different stages of development are accessible to astronomers for observation and study.
(D) There are globular clusters that have not so far been detected by astronomers.
(E)Redwoods and globular clusters must both be studied intensively now, while they still exist in sufficient numbers.
我选A,答案是C, 觉得C正确，但不知道A错在哪里阿？
Mayor of Plainsville: In order to help the economy of Plainsville, I am using some of our tax revenues to help bring a major highway through the town and thereby attract new business to Plainsville.
Citizens' group: You must have interests other than our economy in mind. If you were really interested in helping out economy you would instead alocate the reenues to building a new business park, since it would bring in twice the business that your highway would.
which one of the following principles, if accepted, would most help the citizen's group to justify drawing its conclusion that the mayor has in mind interests other than Plainsville's economy?
(A)Anyone really pursuing a cause will choose the means that that person believes will advance the cause the farthest.
(B) Any goal that includes helping the economy of a community will require public revenues in order to be achieved.
(C) Anyone planning to use resources collected from a group must consult the members of the group before using the resources.
(D) Any cause worth committing oneself to must include specific goals toward which one can work.
(E)Any cause not pursed by public officials, if it is to be pursued at all, must be pursued by memebers of the community.
答案是D，我选了A, 郁闷，不知道错在哪里。上班是偷偷打的，有拼写错误请不要见怪阿！
先谢过了！
1.A 太GENERAL，如果是 principle using in studying of the evolution of a single tree can apply in astronomy to the study of the life story of globular clusters.则是答案。其实将A取非，原文结论仍成立便知不是假设
2。A错在它不能JUSTIFY市民的结论的推出。相反是市民结论不能合理推出，因为假如A原则，则市长可以就是相信 建公路 能促进经济才决定这样做，不是出之个人利益。
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