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
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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
单项选择题
It is agreed that a person is more likely to suffer from arteriosclerosis ______.
A．as he becomes older
B．if his immune system does not work properly
C．when the cells of his brain and spinal chord decline
D．when the cells in his kidneys decline in number
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