题目内容
（请给出正确答案）
[主观题]
According to the passage, which of the following causes Alzheimer's disease？A．Sever emotio
According to the passage, which of the following causes Alzheimer's disease？
A．Sever emotional stress.
B．Nutritional deficiency.
C．The death of nerve cells in the cerebral cortex.
D．Severe head trauma.
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