[解析]
(1)C.细节理解题。根据第二段中的It found that their average sodium intake was 3,256 milligrams per day.That equals nearly 1.5 teaspoons each day,which is 50% more than current guidelines recommend.(研究发现,他们的平均钠摄入量为每天3256毫克。这相当于每天将近1.5茶匙,比现行指南推荐的量多50%。)可知,疾控中心的研究发现美国青少年食盐摄入量超标。故选C。
(2)A.词义猜测题。根据下文There are other sodium sources ﹣ like bread and cold cuts ﹣ adding to the salt overload.(还有其他钠来源,如面包和冷盘,增加了盐的过量摄入。)并结合划线词所在句子Much of the sodium that kids eat comes from processed foods.But potato chips and other salty snacks aren't the only culprits.(孩子们吃的大部分钠来自加工食品。但是薯片和其他咸零食并不是唯一的culprits。)可知,此处culprits意为"罪魁祸首",结合选项A.Criminals.罪犯;B.Results.结果;C.Types.类型;D.Surprises.意想不到的事。故选A。
(3)B.推理判断题。根据倒数第二段中的"Small changes in sodium in foods are not usually noticed," Quader says.Eventually,she adds,the effort will reset a kid's taste buds(味蕾)so the salt desires stop.("食物中钠的微小变化通常不会被注意到,"Quader说。她补充道,最终,这种努力将会重置孩子的味蕾,让他们停止对盐的渴望。)可知,Quader给孩子们的建议是吃低钠食物。故选B。
(4)C.细节理解题。根据最后一段中的High blood pressure can make it difficult to be active.(高血压会使人很难保持活跃。)可知,根据Murphy所说,高盐饮食可能会引起高血压,而高血压会让人不活跃。故选C。