单项选择题

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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单项选择题
Pneumonia is closely related to ______.
A．the decline in ceils of the spinal chord
B．the slower rote of reaction
C．the decline in the immune system
D．the loss of cells in kidneys
单项选择题
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
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