試題詳解

49. Why did many researchers choose to study only male rodents in laboratories?
(A) They think female rodents are not representative of the group.
(B) They fbund female rodents are more likely to be resistant to treatments.
(C) Male rodents display more observable symptoms.
(D) The、think 伐male rodents' hormones make data inconsistent.
(E) This has been historically true and people stop questioning it.