第一节 单项填空（共15小题；每小题1分，满分15分）
( ) 21. –-Mike was fired yesterday.
--- ________ ? He is the laziest person I have ever had to work with.
A. What if B. Like what C. What for D. So what
( ) 22. All passengers please ________ your tickets when you board the plane.
A. reflect B. present C. appear D. prove
