大脑科学的研究表明：音乐的波动能以生物电的形式影响人的记忆神经元，使大脑神经元上的突触数增加，轴突变粗，从而改变大脑进行信息交换和加强思维能力的物质基础。因此，美好的音乐能给大脑一个良好的思维基础，使人的性情和智力得到优化。
这段文字主要强调的是( )。
A．音乐可以改善大脑的结构
B．美好的音乐可以优化人的性情和智力
C．大脑结构的改变能够影响人的性情和智力
D．良好的思维基础离不开优美的音乐
参考答案：B
解析： 文段中前半段主要说音乐的波动能改善大脑的结构，而结构决定大脑的信息交换和思维能力，后半段得出结论，即美好音乐可以优化人的性情和智力，显然这段文字的重点在后半段，选B。A项并不是文段的重点所在，C、D项偷换了论述范围，予以排除。本题正确答案为B。
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