单项选择题

According to the passage, which of the following causes Alzheimer's disease

A．Severe emotional stress.
B．Nutritional deficiency.
C．The death of nerve cells in the cerebral cortex.
D．Severe head traum
<上一题 目录 下一题>
热门 试题

单项选择题
In the last paragraph the author points out that ______.
A．sleeping less is good for human development
B．people ought to be persuaded to sleep less than before
C．it is incorrect to say that people sleep too little
D．those who can sleep less should be encouraged
单项选择题
We learn from the passage that the author ______.
A．comments on three different opinions
B．favours one of the three opinions
C．explains an opinion of his own
D．revises someone else's opinion
相关试题