[简答]  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”。　1.Helenisworriedaboutfoodsafety.2.Sofar,thecontaminatedbabymilkhasn'tcausedanydeathsyet.3.Foodincidentsoccurnotasoftennowadaysasbefore.4.Foodsafetyisanoldproblem.5.Publicconfidenceinthemilkindustrywillbebacksoon.