数字微波通信中波道切换一般不在（）上进行.A.射频 B.中频 C.基带_爱下问搜题

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问题单项选择题

数字微波通信中波道切换一般不在（）上进行.

A.射频

B.中频

C.基带

答案

参考答案：A

完形填空

Flying first class was a new experience for us. We were happy to join the other few passengers who 36 fly in such luxury（奢侈）. It was almost as if we had a sense of 37 to be sitting with the group of people that 38 us.
As we chatted away about our travel, I could hear people around us talked about 39 business meetings. It wasn’t long before I __40 that these people were used to flying in luxury. They are 41 people I thought.
We noticed that the stewardess（女乘务员）was working non-stop to ensure the 42 of the first class passengers. She could not walk by a seat without receiving a(n) 43 . I thought how much she must love her job, 44 she smiled kindly at each person while 45 to their needs.
As the stewardess walked by our seats near the 46 of the flight, I looked at her and said, “Thank you and I hope you’ll have a great night.”She stopped at our seats with a look of 47 , bent down, looked at me and said, “Excuse me?” I 48 my words and she smiled in a rather 49 way, almost as if I had asked her a question that she did not know how to answer. After a few moments she said, “I can 50 you work with the public.”“Why do you think so?” I asked. She answered very quietly, “Because you are the _51 pass

enger here to say thank you and I really 52 your kindess.
The sense of belonging to the elite（精英）group of people in first cl

ass 53 as we heard her words. Our seats in luxury offered us 54 a comfortable

ride. We were reminded that without 55 we would be flying in no class.

B．disappointment

B．accompanied

小题7:A. safety B. rest C. food D

D．misunderstand

C．disappeared

A．rather than

B．better than

问答题简答题

云冈石窟的开凿标志着中国北方佛教中心的转移，请问云冈石窟开凿前后的佛教中心分别是哪两个地方？