A functional decline is ______.A．the reduction in brain nerve cellsB．the decline in memory
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A functional decline is ______.
A．the reduction in brain nerve cells
B．the decline in memory
C．the loss of cells in hearing process
D．the shrinkage in muscle tissues
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正确答案：A
解析：第一段作者提到important tissues．．．to the brain shrink and become less competent with age．Many of these changes are reflected in functional decline，可以判断功能性减退指的是脑神经细胞的减少，而记忆减退只是其中的表现之一。