2-C. (b) The likely explanation for survival.(b) The likely explanation for survival.
(b) 可能性のある説明、生存のためのダヨ。
3-C. (6) So together with their high rates of reproduction and the survival of those that have adapted in some beneficial way, mouse-like rodents are in a strong position to survive well into the future.(6) So together with their high rates of reproduction and the survival of those that have adapted in some beneficial way, mouse-like rodents are in a strong position to survive well into the future.
4-C. Many rats and mice are eaten by other animals before they die of natural causes, so being able to reproduce quickly is a good thing as it increases the species' chances of survival.Many rats and mice are eaten by other animals before they die of natural causes, so being able to reproduce quickly is a good thing as it increases the species' chances of survival.