问题
多项选择题
一个安全的网络系统具有的特点是（）。
A、保持各种数据的机密
B、保持所有信息、数据及系统中各种程序的完整性和准确性
C、保证合法访问者的访问和接受正常的服务
D、保证网络在任何时刻都有很高的传输速度
E、保证各方面的工作符合法律、规则、许可证、合同等标准
答案
参考答案：A, B, C, E
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一个安全的网络系统具有的特点是（）。
A、保持各种数据的机密
B、保持所有信息、数据及系统中各种程序的完整性和准确性
C、保证合法访问者的访问和接受正常的服务
D、保证网络在任何时刻都有很高的传输速度
E、保证各方面的工作符合法律、规则、许可证、合同等标准
参考答案：A, B, C, E
| 完形填空。 | |||
| Here is a story about a clever dog. It was a seeing-eye dog. A seeing-eye dog can help blind (瞎的) people walk along the streets and do many other things. One day a seeing-eye dog and a blind man __1__ on bus together. The bus was full of __2__ and there were__3__ seats left. But one man soon stood up and left his seat. The dog __4__ the blind man to the seat, but there was little space (空间) for two people. The dog began to push the people on each side __5__ his nose. He pushed and pushed until the people moved and __6__ there was __7__ space for two people. The blind man than sat down and the dog got up on the seat at his side. The dog __8__ down and put his head on the leg of the __9__ man. He was very comfortable and soon fell asleep. Everyone on the bus __10__ at the dog. | |||
| ( ) 1. A. got ( ) 2. A. foreigners ( ) 3. A. no ( ) 4. A. told ( ) 5. A. for ( ) 6. A. at first ( ) 7. A. less ( ) 8. A. went ( ) 9. A. old ( )10. A. smiled | B. went B. policemen B. not many B. asked B. to B. still B. enough B. put B. blind B. watched | C. came C. people C. enough C. carried C. with C. at last C. few C. lay C. young C. laughed | D. put D. farmers D. some D. took D. at D. last D. litter D. jumped D. first D. looked |