单选题 As far as aging is concerned ______.

A、 the changes inside human bodies are more important than exterior ones
B、 the loss of competence is more significant than that of cells
C、 the shrinkage of muscles is more significant than the decline in height
D、 the thinning of hair is less important than the wrinkling of skin

【正确答案】 A

【答案解析】第一段先讲了随着年龄的增长，人类的外在变化，接着又指出Internally，and even more significantly,...loss of cells．．．可以判断选项A正确。