27、Recently documented examples of neurogenesis, the production of new brain cells, include the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that learn new songs.

　　(A) the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that

　　(B) mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they

　　(C) mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they

　　(D) the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they

　　(E) brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that

　　原文意思：

　　说最近一些例子包括了 mice 脑子的增长和 canaries 的增加

　　题目分析：

　　原文体现了例子包含的两个内容形成的一个并列关系，应该是脑子的增长和 C 的增加，A 说的不是两种增长形成并列而是脑子和 neurons 进行了并列，语义不对，干掉。

　　B 也是脑子和 neurons 形成并列，干掉。

　　C 同理，干掉。D 前面用 when placed 没育告诉我 placed 的发起者后面说 when they 告诉了发起者，前后明显不对应，干掉。

　　E 前面是 brain growth 后面加个从句后面是 increase in neurons 后面加一个从句，很对应，选这个。