[求助]关于Assumption题中否定削弱的一些疑问

费费逻辑Test2-21

Historian: We can learn about the medical history of individuals through chemical analysis of their hair. It is likely, for example, that Isaac Newton’s psychological problems were due to mercury poisoning; traces of mercury were found in his hair. Analysis is now being done on a lock of Beethoven’s hair. Although no convincing argument has shown that Beethoven ever had a venereal disease, some people hypothesize that venereal disease caused his deafness. Since mercury was commonly ingested in Beethoven’s time to treat venereal disease, if researchers find a trace of mercury in his hair, we can conclude that this hypothesis is correct.

Which one of the following is an assumption on which the historian’s argument depends?

A.       None of the mercury introduced into the body can be eliminated.

B.        Some people in Beethoven’s time did not ingest mercury.

C.        Mercury is an effective treatment for venereal disease.

D.       Mercury poisoning can cause deafness in people with venereal disease.

E.    Beethoven suffered from psychological problems of the same severity as Newton’s.

在做该题时，首先想到not+weaken的方法。B选项否定得到：
            Some people in Beethoven’s time  ingested mercury. 我不是很理解为什么这句话构成了削弱，还请各位指导一下。

另外，费费逻辑上对这道题的解释是这样的：There should be 2 assumptions to support the hypothesis. The 1st assumption of the author is that only venereal disease will be treated by mercury in Beethoven’s time. The 2nd assumption is only some people in Beethoven's time will ingest mercury, if all people ingest mercury, the evidence is not useful. So, some people in Beethoven's time did not ingest mercury. The answer should be B.在考场上那种极度紧张兴奋的情况下，肯定不会想到这么多，那么在时间紧迫的情况下怎么来做这种类型的题目呢？还请大家分享一下自己的经验和tips,谢谢啦~~