They’re arguing on who, on earth, is known for the great discovery penicillin, an effective bacteria killer.
A. making up
B. making into
C. made of
D. made from
网友回答
A. making up
B. making into
(答案→)C. made of
D. made from
解析：
这题考查的是：make the discovery of penicillin“发现了青霉素”这个词组的变形，the great discovery made of penicillin这里made of penicillin是定语修饰the great discovery。选C。