(单选题)

Why does the author say that one needn’t be concerned about memory slips?

A.Not all of them are symptoms of dementia.

B.They occur only among certain groups of people.

C.Not all of them are related to one’s age.

D.They are quite common among fifty-year-olds.

参考答案：A

参考解析：

细节理解题。根据关键词needn’t be concerned和memory slips定位到第一段第三和第四句，原文“there are pretty clear differences between signs of dementia and age-related memory loss”与A选项意思一致。其他三个选项均不符题意。故选A。

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