听力题目:
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.