(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。根据第一段第三句和第四句“But if you have memory slips, you probably needn’t worry. There are pretty clear differences between signs of dementia and age-related memory loss.”可知，痴呆症和与年龄相关的记忆损失是有区别的。也就是说，不是所有的记忆流失都是痴呆症的症状。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