填空题 It's so calorie-dense that it's very difficult for average people to burn off all the calories they consume in a day when sugar is a major com 1 of their diet.
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【正确答案】 1、component    
【答案解析】[译文] 如果人们饮食中的主要成分是糖，那就有太多的热量，普通人很难把一天里摄入的热量消耗掉。