(单选题)14: 关于集线器说法正确的是( ) A: 工作于网络层 B: 具路由功能 C: 属于网络安全设备 D: 对信号进行放大 ...
(单选题)8: 以下属于网络安全设备的是 ( ) A: 防火墙 B: 路由器 C: 中继器 D: 交换机 ...
(单选题)2: SMTP协议默认使用的端口号是 ( ) A: 25 B: 110 C: 80 D: 22 ...
(单选题)21: This coastal area ________ a national wildlife reserve last year. A: was named B: named C: is named D: Names ...
(单选题)9: — Paul, _______? — Oh, that’s my father! And beside him, my mother. A: what is the person over there B: who’s talking over there C: what are they doing D: which is that ...
(单选题)16: You don’t mind ___you Xiao Li, do you? A: call B: to call C: to calling D: calling ...
(单选题)23: "I have never seen a Beijing policeman." "You_____ one. You've been in Beijing a week already." A: must see B: will have seen C: would have seen D: must have seen ...
(单选题)19: "What can I do for you?" "If you ______ see Mr. Li, tell him I've got his letter and I'll write to him soon. A: must B: may not C: won't D: should ...
(单选题)7: I needn't have taken a taxi. I______, it was only a hundred meters. A: could walk B: should walk C: could have walked D: ought to walk ...
(单选题)15: — Let me introduce myself. I’m Steward. — ____________________ A: What a pleasure. B: Pleased to meet you. C: I don’t know. D: Thanks a lot. ...