返回

托福阅读

2013托福考试备考:托福阅读必备背景资料(十二)

The loss of genes that guide the development of fins may help to explain how fish evolved into four-limbed vertebrates, according to a study. In the late Devonian period, around 365 million years ago, fish-like creatures started venturing from sha...

2013托福考试备考:托福阅读必备背景资料(十二)的相关文章