(单选题)

What can we know from the passage?

A.Nerve fibers in the brain will cause Alzheimer’s disease.

B.Early treatment may stop Alzheimer’s disease occurring.

C.When one suffers from Alzheimer’s disease, he will be buried.

D.It is still unknown what causes the changes in the brain’s nerve fibers.

参考答案：D

参考解析：

细节理解题。根据文章第四段第一句“While no one is certain about the reasons of these changes in the brain’s nerve fibers”可知，A项错误。B项和C项在文章中并没有提到。根据文章第四段第一句“While no one is certain about the reasons of these changes in the brain’s nerve fibers”可知，没有人确定造成大脑中神经纤维变化的原因是什么。故选D。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语