问答题 It is reported that Facebook could be a key in mapping which geographical areas have the most overweight and obese people. Researchers have found that the higher the percentage of people in a city or town with Facebook "interests" suggesting a healthy lifestyle, the lower that area’s obesity rate. At the same time, areas with a large percentage of Facebook users with television-related "interests" tend to have higher rates of obesity.

【正确答案】lower levels

【答案解析】文章第三段和第四段指出，在对活动相关的项目感兴趣的脸书用户比例最高的美国地区，肥胖率比该比例最低的地区低12％。同样，在全国范围内，对电视相关感兴趣的用户比例最高的地方的肥胖率比该比例最低的地区高3.9％。由此可知，在脸书用户表示更喜欢体育活动的地区，肥胖率低于那些用户更喜欢看电视等被动兴趣的城市。故空格处应填lower levels。