試題詳解

25. In paragraph 8, what does the sentence “Somehow, this triggers a switch to parthenogenesis” suggest?
(A) Scientists are unclear as to how female whiptails can clone themselves.
(B) Hybridization is a complex, but manageable process.
(C) Scientists are still looking for the switch that causes cloning.
(D) No one knows why female whiptails choose cloning over mating.