这题看不太懂呀，句子绕，哪位能解释一下？

frankzhiwei

Historian:Newton developed mathematical concepts and techniques that are fundamental to modern calculus.Leibniz developed closely analogous concepts and techniques.It has traditionally been thought that these discoveries were independent.Researchers have, however, recently discovered notes of Leibniz’ that discuss one of Newton’s books on mathematics.Several scholars have argued that since the book includes a presentation of Newton’s calculus concepts and techniques, and since the notes were written before Leibniz’ own development of calculus concepts and techniques, it is virtually certain that the traditional view is false.A more cautious conclusion than this is called for, however.Leibniz’ notes are limited to early sections of Newton’s book, sections that precede the ones in which Newton’s calculus concepts and techniques are presented.

In the historian’s reasoning, the two boldfaced portions play which of the following roles?

A.The first provides evidence in support of the overall position that the historian defends; the second is evidence that has been used to support an opposing position.

B.The first provides evidence in support of the overall position that the historian defends; the second is that position.

C.The first provides evidence in support of an intermediate conclusion that is drawn to provide support for the overall position that the historian defends; the second provides evidence against that intermediate conclusion.

D.The first is evidence that has been used to support a conclusion that the historian criticizes; the second is evidence offered in support of the historian’s own position.

E.The first is evidence that has been used to support a conclusion that the historian criticizes; the second is further information that substantiates that evidence.

万分感谢！！

Helloface

文章分为三个结论的：
1. 传统结论一：N和L的理念是各自独立的——后来这结论被批斗了；
2. 现代结论二：现在的历史学家反驳，引了两个since来说是其实N和L的理论相关的；
3. 延展结论三：关键是however后面是一个新的结。“A more cautious conclusion than this is called for”一个更严密的结论得出来了……

shencangbulu

同意楼上的.
历史学家要说自己的观点,在抛出他自己的观点之前,他先抛出了两个观点,一是传统观点N与L观点是不分伯仲的,二是现代观点,L其实是站在N的肩膀上的,N才是真正的牛老大,无人能比,引用L理论中出现的种种线索证明.但是,以上都不是终极观点.终极观点在前文铺垫下终于华丽登场,历史学家提了一个细节线索论证,早期的...云云.