2018年6月英语四级阅读答案：试卷三仔细阅读1（新东方版）

46.A.Not all of them are symptoms of dementia.

47.C.Communication within our brain weakens.

48.B.Inability to recall details of one’s life experience.

49.C.Turn to a professional for assistance.

50.D.Staying active both physically and mentally