Question

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

Answer 1

C

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。