请问这提奇怪的类比推理？

bettyofarim

1.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 single tree. Exactly the same  principle  applies in astronomy to the study of the life story of globular clusters, huge sperical aggregations  of about a million stars all swarming about each other .

A.the methods of scientists in one field  gnerally carry over to other fields even if the subject matter is vastly different.

B.globular cluster at dfferent  stages of development  are accessible to astronomers for observation and study.
问假设

答案是B， 但是为什么A不对呢？ 题目应该是类比推理把，用A不是可以把两者差异连接起来吗？

hedgeforfun

植物学方法类比天文学方法
和一门学科的方法可以用于其他完全不同的学科领域.
这两层意思还是不完全相同的,
细细体会一下
不过这题取非比较好做,取非后,a是有削弱的,但b简直是摧毁了论证,选b