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阅读理解。
     We may all have had the embarrassing moment: Getting half-way through a story only to realize that we've
told this exact tale before, to the same person. Why do we make such memory mistakes?
     According to research published in Psychological Science, it may have to do with the way our brains
process different types of memory.
     Researchers Nigel Gopie, of the Rotman Research Institute in Toronto, and Colin Macleod, of the University
of Waterloo, divided memory into two kinds. The first was source memory, or the ability to keep track of
where information is coming from. The second was destination memory, or the ability to recall who we have
given information to.
     They found that source memory functions better than destination memory, in part because of the direction
in which that information is travelling.
     To study the differences between source and destination memory, the researchers did an experiment on 60
university students, according to a New York Times report. The students were asked to associate (联想) 50
random (随意的) facts with the faces of 50 famous people. Half of the students "told" each fact to one of the
faces, reading it aloud when the celebrity's (名人的) picture appeared on a computer screen. The other half
read each fact silently and saw a different celebrity picture afterward.
     When later asked to recall which facts went with which faces, the students who were giving information
out (destination memory) scored about 16 percent lower on memory performance compared with the students
receiving information (source memory).
     The researchers concluded that out-going information was less associated with its environmental context
(背景) that is, the person-than was incoming information.
     This makes sense given what is known about attention. A person who is giving information, even little facts,
will devote some mental resources to thinking about what is being said. Because our attention is limited, we give
less attention to the person we are giving information to.
     After a second experiment with another group of 40 students, the researchers concluded that self-focus is
another factor that undermines destination memory.
     They asked half the students to continue giving out random information, while the other told things about
themselves. This time around, those who were talking about themselves did 15 percent worse than those giving
random information.
     "When you start telling these personal facts compared with non-self facts, suddenly destination memory
goes down more, suggesting that it is the self-focus component (成分) that's reducing the memory," Gopie
told Live Science.
1. The point of this article is to _____.
[     ]
A. give advice on how to improve memory
B. say what causes the memory to worsen
C. explain why we repeat stories to those we've already told them to
D. discuss the differences between source and destination memory
2. What can we learn from the article?
[     ]
A. Source memory helps us remember who we have told the information to.
B. One's limited attention is one of the reasons why those reading aloud to the celebrity's pictures perform 
    worse on the memory test.
C. Silent reading is a better way to remember information than reading aloud.
D. It tends to be more difficult for people to link incoming information with its environmental context than 
    outgoing information.
3. The underlined word "undermines" probably means _____.
[     ]
A. weakens
B. benefits
C. explains
D. supports
4. What did the scientists conclude from the second experiment?
[     ]
A. Destination memory is weaker than source memory.
B. Focusing attention on oneself leads to relatively poor source memory performance.
C. Associating personal experience with information helps people memorize better.
D. Self-focus is responsible for giving information twice or more to the same person.
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