【单选题】What is the passage mainly about  ______.
                    
A.The process of gradual memory loss
B.The causes of absent-mindedness
C.The impact of the environment on memory
D.A way of encoding and recalling
                
							【单选题】What is the passage mainly about  ______.
                    
A.The process of gradual memory loss
B.The causes of absent-mindedness
C.The impact of the environment on memory
D.A way of encoding and recalling
                
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