[单选]  二、听力理解听对话录音，根据对话内容判断正误（每题10分）。操作提示：句子正确选择下拉选项框为“T”；句子错误选择下拉选项框为“F”。　Helenisworriedaboutfoodsafety.   2.Sofar,thecontaminatedbabymilkhasn'tcausedanydeathsyet.   3.Foodincidentsoccurnotasoftennowadaysasbefore.   4.Foodsafetyisanoldproblem.   5.Publicconfidenceinthemilkindustrywillbebacksoon.