試題詳解

41. What is the main topic of this passage?
(A) Timing treatments are boost efficacy and lower the effect sides .
(B) Scientists devoted themselves to study human’s circadian rhythms and have some findings.
(C) Certain flowers open and close on schedule, a gardener could use them to build a flower clock.
(D) Creatures have their circadian rhythms, humans can benefit greatly from applying them.