D．The teenage brain drives them to be different.

　　解析：选D　主旨大意题。通读全文可知，本文主要讨论了在青少年成长的过程中，大脑的变化促使他们区别于其他年龄段的人。D项能概括文章大意。故答案选D。

　　Ⅱ.阅读七选五

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