(B) Some people in Beethoven’s time did not ingest mercury.
这个的negation就是No people in Beethoven’s time did not ingest mercury. some代表1%-100%,negate就是0%了啊 没有什么好纠结的啊。 而no people in beethoven's time did not ingest mercury=everyone in beethoven's time ingest mercury
some people hypothesize that venereal disease caused his deafness.
If everyone ate Hg, then we cannot based on the finding that M's hair contains Hg to deduce he ate Hg to cure venereal disease. The conclusion falls apart.