第34题: [单项选择]Passage One Questions 26 to 28 are based on the passage you have just heard.[A] Catching runaway criminals. [C] Patrolling the dangerous town. [B] Scratching the hidden bombs. [D] Drag-sniffing or bomb-sniffing. 参考答案:D 答案解析:[听力原文] What do dogs learn during the 9-week training