27.A 推理判断。根据第4段第2句话 Bandwidth(宽带) is the limiting factor for sending complex(复杂) medical pictures around the world — CT photos being one of the biggest bandwidth users可知答案为A。

　　考点：考查健康环保类短文阅读

　　Children who spend more time outdoors may have a lower risk of becoming nearsighted, new research suggests.

　　In the study, researchers looked at about 1,900 schoolchildren. The scientists found that the kids who had been instructed to spend more time outdoors over three years were 23 percent less likely to develop nearsightedness during this time than those who had not been instructed to spend more time outdoors. Moreover, among the kids who did become nearsighted during the study, the degree to which their eyesight worsened was slightly smaller among those who spent more time outdoors.

　　The researchers selected six schools and required the children, whose average age was 7 at the start of the study, to attend one additional 60-minute class of outdoor activities during each school day for three years. The parents of these children were also encouraged to engage their children in outdoor activities after school, especially during weekends and holidays. The other half of the children, from another six schools, continued their usual activity patterns. After three years, 30.4 percent of the kids in the intervention group (干预组) had become nearsighted, compared with 38.5 percent of the kids in the other group.

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