46. What can be inferred from the passage about penicillin?
(A) It effectively treats fungus infections.
(B) It was developed before nystatin.
(C) It was developed before the Second World War.
(D) One of its by-products is nystatin.
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一開始普遍使用的的盤尼西林和鏈黴素會殺死...
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