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<4-34> 与下列掩码相对应的网络前缀各有多少位？（1）192.0.0.0；（2）240.0.0.0；（3）255.254.0.0；（4）255.255.255.252。

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<4-35 > 已知地址块中的一个地址是140.120.84.24/20 。试求这个地址块中的最小地址和最大地址。地址掩码是什么？地址块中共有多少个地址？相当千多少个 C 类地址？

Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A), B), C) and D). Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.Things like phones and driverless cars need special hardware to _______ use of 5G networks.

A. do
B. make
C. develop
D. take

Jack decided to go to the shop __________ person to make the request for a refund.

A. on
B. in
C. with
D. over

Keep in __________ that building strong relationships with our customers is our top priority.

A. mind
B. attention
C. brain
D. thought