TASK3_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. What is the product they are talking about? {A; B; C} 2. What is the problem with the product? {A; B; C} 3. Who first finds out the problem? {A; B; C} 4. Who first receives the customer's complaints? {A; B; C} 5. What is the source of the problem? {A; B; C}