问题
单项选择题
在因特网中，屏蔽各个物理网络的差异主要通过以下哪个协议实现______。
A．NETBEIU
B．IP
C．TCP
D．SNMP
答案
参考答案：B
解析： IP协议作为一种互联网协议，运行于互联层，屏蔽各个物理网络的细节和差异。
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在因特网中，屏蔽各个物理网络的差异主要通过以下哪个协议实现______。
A．NETBEIU
B．IP
C．TCP
D．SNMP
参考答案：B
解析： IP协议作为一种互联网协议，运行于互联层，屏蔽各个物理网络的细节和差异。
The “Doorman” On a trip to California, my family stopped for lunch. As we walked toward the entrance to the restaurant, a man, with a beard and dirty hair, jumped up from a bench and opened the door for us．Regardless of his , he greeted us in a friendly way． Once inside, my daughters whispered, “Mom, he .” After we ordered our lunch, I explained, telling the kids to look the dirt．We then watched other customers approach the restaurant but many him．Seeing this rudeness truly upset me．The day I became a mother, I had resolved to set a good for my children．Yet sometimes when things didn’t go right, being a good example was . When our meal arrived, I realized I had left the car-sick pills in the truck．With the windiest trip ahead, the kids needed them, so I myself from the meal and went to get them． Just then, the “doorman” was opening the door for a couple．They rushed past him without even acknowledging his . Letting them in first, I said a loud “thank you” to him as I ． When I returned, we talked a bit．He said he was not allowed inside he purchased food．I went back and told my family his .Then I asked our waitress to add one soup and sandwich．The kids looked as we had already eaten, but when I said the order was for the “doorman” , they smiled．When it was time to our trip, I noticed the "doorman" enjoying his meal．Upon seeing me, he stood up and thanked me heartily．He then his hand for a handshake and I gratefully accepted．I suddenly noticed the tears in his eyes—tears of .What happened next drew great astonishment: I gave the “doorman” a ! He could hardly say a word, with tears down his face． Back in truck, I fell into deep thought．While we can't choose many things in life, we can choose when to show gratitude．I said thanks to a man who had held open a door for me, and also said thanks for that to teach my children by example．
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