【单选题】
在下面给出的协议中，_______是TCP/IP的应用层协议。___
A. TCP和FTP
B. DNS和SMTP
C. RARP和DNS
D. IP和UDP
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答案
B
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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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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___。
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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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This kind of exercise will ___ your creativity, renew your energy, and unlock your potential.
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I’ll be happy to help you, ___ you won’t take up too much of my time.
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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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He has made it very clear ___ we should observe the new rules.
A. what
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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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No other drugs are as good as this one; it must have been based on a(n) ___ formula (配方).
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Mothers tend to be too ___ toward their children. They should let them see more of the worl D.
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The investigation ___ evidence of a large-scale illegal trade in wild birds.
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Poor Laura! I feel so sorry for her. When she fell, she hurt her arm and, ___, broke her glasses.
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Showing some sense of humor can be a(n) ___ way to deal with some stressful situations.
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【单选题】
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