According to the passage, human memory ______
A.can store less than what people thought       
B.was thought to be more efficient than it is supposed
C.is more complex than computer memory     
D. causes a lot of problems for researchers

The word that in paragraph 1 refers to ______.
A.human memory 
B.the problem  
C.the memory  
D. the sophistication

__________(45)
A.tells
B.suggests  
C.promotes      
D.compares

The passage mainly discusses ______.  
A.an experiment done by Dr. Wilder Penfield    
B. human memory 
C.chemical reactions in the brain  
D.a computer’s memory compared with human’s

The word bonds in paragraph 2 is closest in meaning to ______.
A.agreements         
B.connections         
C.agencies  
D.effects

According to most theories, which of the following is NOT affected by memory trace?
A.Learning           
B.Memory loss     
C.Retention
D. Retrieval possible for a memory

According to the passage, memory trace ______.
A.presents information at a particular time
B. is possibly made by structural changes in the brain
C.has a huge capacity for information storage  
D. is the connection between brain cells

It can be inferred from the first paragraph that ______.
A.before studies were carried out, people had had false assumptions about human memory
B.Dr. Wilder Penfield disagreed with other researchers’ conclusions
C. the Canadian scientist tried to prove that other researchers had been wrong
D.it is easy for people to recall events that they have suddenly forgot

The word emerged  in paragraph 1 mostly means ______.
A.appeared               
B.integrated         
C.originated  
D.vanished

The word their in paragraph 1 refers to ______.
A.brains           
B.subjects    
C.events
D. dreams