问题 单项选择题

多路复用的主要目的不包括( )。

A.提高通信线路利用率

B.提高通信线路通信能力

C.提高通信线路数据率

D.降低通信线路通信费用

答案

参考答案:C

解析: 多路复用的主要目的包括:(1) 提高通信线路利用率;(2) 提高通信线路通信能力;(3) 降低通信线路通信费用。

阅读理解
根据短文内容,从A、B、C、D四个选项中选出最佳答案。
                         Musician Wanted
     Can you play the drums or the guitar?
Would you like to make some money this vacation?
We need two new band members for our group. Are
you interested? Then come for an audition (试演)
on Saturday afternoon at 2:00 p.m., Hopewell Center
Auditorium.

                   New T4 Music Show
     We are looking for a number of people to
come down and be part of our camera
audience, age range 12-15, to dance and have
fun. If you love music, dancing and look good
we would love to hear from you. Choice of
time: 12:45 p.m. or 7:45 p.m. Call the Nokia
Green Room at 556-3826.
                 Conversation Tutor Wanted
Can you speak English? Do you like kids? I need
someone to help my daughters learn English during
their vacation. It doesn't matter if your English isn't
perfect, just as long as you can hold a conversation.
Please call Mrs. Johansson at 555-3721. The pay is
good.
                  Part-time Cleaning Help
Are you looking for a vacation job? Can you
clean house and cook? Then, I need you. The work
is boring, but the pay is good. I need you from 2:00
-5:00, Monday to Saturday. Please call Emily Martin
at 393-7741.

1. If you want to be a tutor, you can call _______.
[ ]
A. 293-7742
B. 555-3721
C. 667-8973
D. 556-3826
2. People who like dancing can come at ________.
[ ]
A. 7:45 p.m.
B. 11:45 a.m.
C. 12:15 p.m.
D. 2:00 p.m.
3. Ms. Martin really needs a ________.
[ ]
A. tutor
B. musician
C. cleaner
D. dancer
4. Julia can _______, she wants to be a band member.
[ ]
A. dance
B. speak English
C. play the violin
D. play the guitar
5. Who will the tutor help?
[ ]
A. Mrs. Johansson
B. Emily
C. Mrs. Johansson's daughter
D. Mrs. Johansson's son
选择题