Flying first class was a new experience
for me. I had a sense of  21 pride  to be flying in such luxury(奢侈).

     I noticed that the stewardess was working
non-stop to ensure the   22 comfort  of the first class passengers. I thought
how much she must love her job as she smiled kindly at each person while   23 attending  to
their needs.

As the stewardess walked by our
seats near the  24   of the flight. I looked at her and said,
"Thank you and I hope you'll have a great night. " She stopped with a
look of  disbelief 25  , bent down, looked at me and said,
"Excuse me?" I repeated my words and she smiled in a rather   26 funny  way,
almost as if I had asked her a question that she did not know how to answer.
Then she said, "I can   27 tell  you work with the public. "
"Why do you think so?" I asked. She answered very quietly,
"Because you are the  28 only passenger here to say 'thank you' to me
tonight. And I really appreciate your kindness. "

     The sense of belonging to the superior
group of people in first class  disappeared 29  as
I heard her words. I was reminded that without  30 kindness  ,
we would be flying in no class.

24. A.
side           B. middle            C. end             D. front

第24题答案选C，这是为什么呢？为什么不可以选B？