Official 42 Lec 3
Question 5 of 6
Why does the professor mention the antibiotic penicillin?

A.

To suggest that more fungi should be investigated as potential sources of medications

B.

To point out that certain heavy metals are needed for the production of penicillin

C.

To criticize the pharmaceutical industry for contributing to environmental pollution

D.

To show how a waste product from one process can be useful in another process

正确答案:D

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