关于代词指代的问题！请各位赐教！prep-64B选项此类的问题~~~跪拜~~~

oranrona

64. (27947-!-item-!-188;#058&003452)

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

64. (27947-!-item-!-188;#058&003452)

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

答案E没问题，我想请问的是B选项的一个小点：

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

这里的两个they是指代什么？注释里说前一个是指代brains，后一个指代neurons。可是不是说代词有限指代主句主语嘛？还有句子里的同一个代词重复出现不是只能指代同一个东西吗？我是菜鸟，请大家赐教！不胜感激！

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

这里的两个they是指代什么？注释里说前一个是指代brains，后一个指代neurons。可是不是说代词有限指代主句主语嘛？还有句子里的同一个代词重复出现不是只能指代同一个东西吗？我是菜鸟，请大家赐教！不胜感激！

思兼

回答lz问题~~~
注释里说前一个指代brains，后一个指代neurons是对的，同时也没有违背"优先指代主句主语"和"同一个句子里同一个代词只能指代同一个对象”的原则。
请lz细心观察B选项。

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

首先这是用or连接的由两个句子组成的并列句。
所以，第一个they和第二个they不是在一个句子里，而是分别在两个由or连接的并列的句子里，因此也就不违背"同一个句子里同一个代词只能指代同一个对象”的原则。

然后，每个并列句是由从句套从句的形式组成的，第二个从句的代词they优先指代其前一个从句的主语。
如第一个并列句：
mice   whose brains grow   when they are placed in a stimulating environment
主句  从句  从句主语    从句 指代前一个从句的主语。

以上观点为个人见解~~~希望能够帮到楼主！！
欢迎大家踊跃拍砖~~~