题目内容

Passage One Questions 26 to 29 are based on the passage you have just beard.

A. Diet has nothing to do with health.
B. The amount of food has something to do with health.
C. Health depends on diet totally.
D. Good food has nothing to do with health.

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统一考录制度是指新招录公安民警，一律实行省级公安机关统一考试，公安部派人督考，切实严把“人口关”，从源头上保证队伍的基本素质。( )

A. 对
B. 错

Packet-switching wireless networks are preferable (41) when transmissions are (42) because of the way charges are (43) per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are (44) for the (45) of time they use the net-work.

A. long
B. short
C. large
D. small

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Open Shortest Path First (OSPF) is a (36) routing algorithm that (37) work clone on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (38) processing power. The (39) algorithm is used to calculate routes. OSPF routing table updates only take place when necessary, (40) at regular intervals.

A. more
B. less
C. same
D. most

采用可变长子网掩码技术可以把大的网络分成小的子网，例如把子网掩码为 255.255.0.0的网络40.15.0.0分为两个子网，假设第一个子网为40.15.0.0/17,则第二个子网为 (1) 。假设用户X1有2000台主机，则至少应给他分配 (2) 个C类网络，如果分配给用户X1的网络号为196.25.64.0，则指定给X1的子网掩码为 (3) ；假设给用户X2分配的C类网络号为196.25.16.0～196.25.31.0，则X2的子网掩码应为 (4) ；如果路由器收到一个目标地址为11000100.00011001.01000011.00100001的数据报，则该数据报应送给 (5) 用户。 4（）

A. 255.255.255.0
B. 255.255.250.0
C. 255.255.248.0
D. 255.255.240.0