17.(A). Jack can’t find his luggage.

　　(B). Jack is learning how to fly a plane.

　　(C). Jack sent the package airmail.

　　(D). Jack’s plane didn’t arrive yet.

　　18.(A). It is evident that there is a hole in it.

　　(B). It is general easy to follow what you say.

　　(C). The whole thing clearly depends on you.

　　(D). Your expression is entirely unique.

　　答案：

　　AB

　　音频文本:

　　17. Well, Jack, let’s hope your bay comes in on the next flight.

　　18. On the whole, you express yourself very clearly.