Unit 22 Environmental Protection
典句观赏
了解诱思
【文章导语】 因为气候、环境等各种原因影响,很多动物濒临灭绝。我们应该怎样拯救它们呢?
典句观赏
了解诱思
An animal species becomes extinct when it fails to                 produce enough young in each generation to keep pace                       with the death-rate.We can tell from fossil evidence in               rocks that many living species have become extinct                   over the millions of years since life began.It is a natural process and extinction is the fate of any animal that has spec ...