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wakesleep2011

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 我知道答案在d,e之间，正确为e，问题是我并未看出用when和that有什么不同，这里有什么语法知识点吗？何时用when何时that？，还有是否也与用“the"修饰brain和increase，以及neurons和canaries有关？还请大牛指教。。。。。

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