45 According to the passage, which of the following statements is true?
(A)In alchemists’ view, the visible and invisible worlds work in different principles.
(B)An alchemist needs to play the role of the god to transform all the rough materials into refined ones, and viceversa.
(C)The key secret to alchemy was discovered by the church in the Middle Ages.
(D)In the Middle Ages, the alchemists tended to disguise themselves as scientists.