This pattern of white matter loss is “similar to those seen in traumatic(外伤的)brain injury” , like that after a serious concussion, the researchers reported, even though only one of these players was reported to have ever experienced a concussion.

　　The players who had headed the ball about 1, 100 times or more in the past year were also generally worse at recalling lists of words read to them, forgetting or fumbling the words far more often than players who had headed the ball less.

　　51. The passage is most probably a　.

　　A. news report

　　B. research report

　　C. story for soccer players

　　D. text for doctors

　　52. In which way can we find the structural changes in the brain?

　　A. Computerized test. B. Questionnaire.

　　C. Scanning.

　　D. M. R. I. technique.

　　53. From the passage we can conclude that frequent heading may have　.

　　A. significant effect on brain

　　B. little effect on one’s brain

　　C. nothing to do with the brain injury

　　D. one’s memory improved

　　54. What is likely to be the cause of memory loss?

　　A. Playing soccer frequently.

　　B. Tests of their memory.

　　C. White matter loss.

　　D. Information processing.

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