–How was your interview with the famous basketball player—Yao Ming?
--I was quite nervous at first, but his warm smile put me .
A. in action
B. at ease
C. on work
D. on watch
网友回答
A. in action
B. at ease
C. on work
D. on watch
解析：考查短语辨析。in action在活动，在运转 at ease舒适；自在 on work工作 on watch值班，监视。根据句意，姚明的温暖笑容使我感到自在。故选B。