17.(A). Here are the facts relevant to the topic.

　　(B). They all expressed their opinions on the topic.

　　(C). That’s the topic, but no one is interested.

　　(D). Those facts have little to do with the topic.

　　18.(A). It’s possible that she got on another plane.

　　(B). She heard that her flight had been canceled.

　　(C). It’s a good thing she didn’t miss her flight.

　　(D). She didn’t think the passengers would miss her.

　　答案与音频文本：

　　DC

　　17. Those facts are interesting, but irrelevant to the present topic.

　　18. To think she might have missed the plane.