prep1-64

15. Recently documented examples of neurogenesis（神经形成）, 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

A: when placed的逻辑主语是production而不是邻近的mice，句意错；动名词growing和increasing应该改成名词growth，increase

B: they指代不明，可以指代brains或mice；第二个they和第一个they不是一个对象

C: they指代brains不对；第二个they和第一个they不是一个对象

D: when placed的逻辑主语是production而不是邻近的mice，句意错；

E: correct

终于搞清楚了答案是E，可是就是不明白为什么主句主语是production, 我觉得主句主语应该是document examples, production是同位语呀。 且谓语动词又是复数形式。所有主句主语应该是documented examples呀。求帮忙，晕死了！！！！！！！！！！！

D: when placed的逻辑主语是production而不是邻近的mice，句意错

why？

楼主的理解是对的，主语是examples,

when无指代

s7s7：为什么when无指代呢？

。。。the brain growth in mice when placed in a stimulating environment or the increase in canaries' neutrons when they learn new songs。

被放在刺激环境下的小老鼠的脑生长 与 学习唱新歌的canary的脑神经增长

when placed是修饰小白鼠

这样的理解对吗？

另外，我现在觉得D是不对，但是错在后一个they指代上有问题，不知指代canaries还是neutrons

they指代就是有问题的

when placed是修饰growth的，它是句子的宾语，In mice只是修饰GROWTH

Recently documented examples of neurogenesis（神经形成）, the production of new brain cells, include
        brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that learn new songs.

绿色：主语

青色：同位语，补充说明neurogenesis

黄色：谓语

深黄：平行

That 可以修饰mice引导定语从句

而when 不行，when引导定语从句只能修饰时间。如果理解成状语从句，这种情况从句是不能省略主语的。因为从句主语与主句主语不同。

这里压根就没有逻辑主语的事，因为没有不定式或者that引导的宾语从句。