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【单选题】
一条高速公路的通信系统一般由（ ）等子系统构成。A.
光纤数字传输系统、数字程控交换系统、会议电视系统、通信电源系统、光电缆工程及通信管道工程
B.
光纤数字传输系统、数字程控交换系统、有线广播系统、通信电源系统、光电缆厂通信管道工程
C.
光纤数字传输系统、数字程控交换系统、紧急电话系统、通信电源系统、光电缆工程及通信管道工程
D.
光纤数字传输系统、数字同步时钟系统、紧急电话系统、通信电源系统、光电缆工程及通信管道工程
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举一反三
【单选题】听力原文：I'd hang on to that letter. You might need it later. What's the speaker going to do with the letter?
A.
He would throw it away.
B.
He would keep it.
C.
He would post it.
D.
He would stick a stamp on it.
【单选题】Don't ______ the speaker. Wait for your turn to ask your question later. [ ]
A.
disturb
B.
tease
C.
interrupt
D.
finish
【单选题】What happened to the speaker later?
A.
He tried to kill himself.
B.
He learned to help others.
C.
He fought against his illness.
D.
He got seriously ill.
【简答题】Speaker A: I have to go. See you later. Speaker B: __________A. See you. B. Goodbye. C. Both A and B.
【单选题】Why are passes mentioned by the speaker?
A.
They can be used for a later show.
B.
They are needed to gain entry to an area.
C.
They are valid at the cafeteria.
D.
They can be exchanged at a special counter.
【简答题】K 2 CrO 4 的碱性溶液在372nm处有最大吸收，若碱性K 2 CrO 4 溶液的浓度为3.00×10 -5 mol·L -1 ，吸收池厚度为1cm，在此波长下测得透射率是71.6%，计算：
【单选题】Later, the speaker found that he might suffer from __________.
A.
anxiety
B.
depression
C.
PTSD
D.
stress
【简答题】Speaker A: I’ve got to go. See you later. Speaker B: __________________________A. See you then. B. Goodbye. C. Both A and B.
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