OG5 阅读 Q52

Choice B is the best answer. According to the passage, Maguire's study revealed that the mental athletes were using the same parts of the brain for memorization as were the London cabbies from the first study, a result that was initially puzzling. The questions in lines 74-78("Why...snowflakes") highlight and expand on that result, making it clear that it is surprising to find that the mental athletes use images to remember numbers or use a part of the brain associated with navigation when trying to remember shapes.  Although it became clear how the mental athletes were memorizing things, it was not clear why they were doing it that way. 
Choice A is incorrect because the questions in lines 74-78("Why...snowflakes") seem to reflect additional questions Maguire and others had based on their result and do not suggest that Maguire's conclusions may not be reliable. Choice C is incorrect because the passage makes no mention of any earlier studies of the phenomenon of using images to remember numbers or to use a part of the brain associated with navigation when trying to remember shapes. Choice D is incorrect because the questions in lines 74-78("Why...snowflakes") specifically address Maguire's two studies but not her earlier work.