According to the data they presented at a Radiological Society of North America meeting last month，the researchers found that the players who had headed the ball more than about 1,100 times in the previous 12 months showed significant loss of white matter in parts of their brains involved with memory，attention and the processing of visual information，compared with players who had headed the ball fewer times.

　　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.

　　1．The passage is most probably a________.

　　A．news report

　　B．research report

　　C．story for soccer players

　　D．text for doctors

　　2．From the passage we can conclude that frequent heading may have________.

　　A．significant effect on one’s brain

　　B．little effect on one’s brain

　　C．nothing to do with the brain injury

　　D．one’s memory improved

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