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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. A, E have nothing to do with the argument. C is not necessary, 'Since mercury was commonly ingested in Beethoven’s time to treat venereal disease' is enough. D is wrong: according to the author, it is the venereal disease that will cause the deafness, not the mercury poison. |
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