第9题: [单项选择]Why could not people use stamps for many times [A] Because the stamps would be taken away when they had been used. [B] Because the stamps would be torn up (撕碎) when they had been used. [C] Because the stamps would be put on seals by the post office. 参考答案:C 答案解析:[考点] 细节题
[解析] 第三段的第四句说明邮局盖戳后邮票就不能再用。
第21题: [单项选择]两台MSR路由器通过广域网连接并通过RIPv2动态完成了远端路由学习,此时路由表已经达到稳定状态,那么此刻起在45秒之内,两台路由器广域网之间一定会有如下哪些报文传递?() A. RIP Request message B. RIP Response message C. RIP Hello time message D. RIP Update message 参考答案:B