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问题：
[单选题]以下关于突触前成分的描述中,哪一项最正确( )。
A、A: 为神经元终末膨大,内含许多突触小泡、少量线粒体、粗面内质网等
B、B: 为神经元终末膨大,内含许多突触小泡、少量线粒体、滑面内质网等
C、C: 为神经元终末膨大,内含许多糖蛋白和一些微丝、微管
D、D: 为神经元终末膨大,由突触前膜、突触小泡、线粒体等组成
E、E: 膜上有特定受体,内表面有致密物质
参考答案：
D
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