听对话录音，根据对话内容判断正误（每题10分）。 TASK3_TEST.MP3 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. Helen is worried about food safety. {T; F} 2. So far, the contaminated baby milk hasn't caused any deaths yet. {T; F} 3. Food incidents occur not as often nowadays as before. {T; F} 4. Food safety is an old problem. {T; F} 5. Public confidence in the milk industry will be back soon. {T; F}"