prep15,搜到过前的讨论,但还是不解,来请教

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是因为不平行,B2个THEY指代不清,C同B, D为啥错呢?

3ks a lot!

1。the brain growth in mice when (growth is) placed in a stimulating environment or the increase in canaries' neurons when they (指代neurons) learn new songs 
指代还是有问题，意思错的

2。BC也逻辑含义不平行。神经形成对应的宾语应该是“长脑子”(brain growth)，而不是brain

另，个人觉得when placed, when learn...这种时间状语，暂不说语法问题，使句子逻辑含义上欠佳

谢谢LALALA,估计大家都睡了,只有我们在米国这边的还在战斗着.

你的解释让我豁然开朗....真是逻辑为大

我在国内...

^_^