单项选择题Part Four Directions: In this section, you will hear two short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D. Passage One 23. What does the lady's comment imply? A、Most Londoners were frightened by the alarms. B、Most Londoners got rather confused about the alarms. C、Most Londoners took the Exercise Flood Call calmly. D、Most Londoners complained about the trouble caused by the Exercise Flood Call.