【单选题】
集线器和路由器分别运行于OSI参考模型的___。
A. 数据链路层和物理层
B. 网络层和传输层
C. 传输层和数据链路层
D. 物理层和网络层
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答案
D
解析
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在下面对OSI参考模型的数据链路层的功能特性描述中，哪一项是不正确的？___
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B. 数据链路层的主要任务是提供一种可靠的通过物理介质传输数据的方法
C. 将数据分解成帧，按顺序传输帧，并处理接收端发回的确认帧
D. Ethernet的数据链路层分为LLC和MAC子层，并在MAC子层使用CSMA/CD协议争用信道
【单选题】
下面属于TCP/IP协议族中网络互联层协议的是___。
A. IGMP、UDP、IP
B. IP、DNS、ICMP
C. ICMP、ARP、IP
D. FTP、IGMP、SMTP
【单选题】
Having practiced so many times, I feel very ___ of my ability to deliver the presentation successfully.
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【单选题】
The university decided to increase the ___ of the lecture hall, which has only 200 seats.
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Smart phones – with cameras and color screens – can ___ images and data using wireless network technology.
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【单选题】
Don’t take someone you get to know from the Internet to your house no matter how ___ he sounds.
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This kind of exercise will ___ your creativity, renew your energy, and unlock your potential.
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He makes his students ___ knowledge through various kinds of interesting activities.
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It was a worthwhile attempt ___ it failed to achieve its purpose that we had hoped for.
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【单选题】
There is no greater importance ___ cultivating independence in children.
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He has made it very clear ___ we should observe the new rules.
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It was when I read his letter ___ I realized he had given me huge help.
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Don’t worry too much, Jane. Your son ___ home already. Let’s go back and check it out.
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___ they have written about the behaviors of animals is hardly anything new.
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The investigation ___ evidence of a large-scale illegal trade in wild birds.
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Showing some sense of humor can be a(n) ___ way to deal with some stressful situations.
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It will be worth the efforts even if you fail; the rewards you ___ will be great.
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【单选题】
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【单选题】
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【单选题】
If you don’t ___ cooking today, we can go out to eat at the new restaurant.
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【单选题】
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【单选题】
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