TASK4_TEST.MP3 操作提示：通过题干后的下拉框选择题目的正确答案。 　 1. The problem with Koukou Old Yogurt is that it contains __________. {A; B; C} 2. We can infer from the dialog that lead is __________. {A; B; C} 3. According to Michael, food safety problems can't be prevented because __________. {A; B; C} 4. Melinda's solution to the food safety problem is __________. {A; B; C} 5. In the dialog, _send a clear message_ to means to __________. {A; B; C}