单选题：Why do some old people look a little shrunken as they age?

题目分类：英语
题目类型：单选题
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题目内容：

Why do some old people look a little shrunken as they age? A．Because their spine is in active use.
B．Because they are more easily affected by gravity.
C．Because they keep growing backwards.
D．Because their spine becomes more bent.

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