【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
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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【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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Having practiced so many times, I feel very ___ of my ability to deliver the presentation successfully.
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He has made it very clear ___ we should observe the new rules.
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___ they have written about the behaviors of animals is hardly anything new.
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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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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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