题目内容

Which one is not the advantage of Semisynthetic antibioticscomparing to naturally occurring antibiotics?

A. more effective,
B. much cheaper;
C. longer lasting,
D. easier to administer

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The key to successful chemotherapy against microbes is:______.

A. selective toxicity;
B. structure of an antibiotic;
C. Molecular size;
D. the spectrum of action

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