23. According to the passage, which of the things listed below did Greek philosophers think at one time or another were the prime substances of the material world?
I. Fire
II. Air
III. Humor
IV. Environments
Your Answer is
Correct Answer is A
Explanation
Humors (body fluids) and environment are factors that Hippocrates believes affect health, and have nothing to do with the topic; so choose fire and air, evidence is on line 28;