问题
单项选择题
一般认为局域网的主要技术有3种，它们是介质访问控制方法、传输介质和______。
A．传输速率
B．网络软件
C．网络拓朴
D．网络硬件
答案
参考答案：C
解析： 局域网的技术特点主要是：一是覆盖有限地理范围；二是具有高数据传输速率和低误码率；三是易于建设和维护。决定上述特性的主要技术因素是介质访问控制方法、网络拓朴和传输介质。
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一般认为局域网的主要技术有3种，它们是介质访问控制方法、传输介质和______。
A．传输速率
B．网络软件
C．网络拓朴
D．网络硬件
参考答案：C
解析： 局域网的技术特点主要是：一是覆盖有限地理范围；二是具有高数据传输速率和低误码率；三是易于建设和维护。决定上述特性的主要技术因素是介质访问控制方法、网络拓朴和传输介质。
Jenny, from Germany, spent some time traveling in India. While she was there, she stayed with her Indian friend, Leela. However, there was a language barrier(障碍) for her there. It was very 31 for her to communicate in the new environment, which was very different from 32 of her own country. One day, together with Leela, Jenny went to 33 an orphanage(孤儿院). All the children there were very young. At first, Jenny was not sure if she could have a way to communicate with them. She went over to the children 34 and sat beside them. After some time, one of the children 35 her. She felt a little relaxed and smiled back. Then she went close to the child. She slowly put her arm around the child and started 36 a song in German. The child kept smiling and started repeating the words after her. The words that came from the little mouth were different from those that Jenny sang, but the rhythm(节奏) was the same. Jenny sat a little more and the child followed her again. Wanting to join in the 37 , another child went up to Jenny and started singing the rhythm. Then more children joined. They 38 many smiles together. From the other side of the hall, Leela was smiling and watching them. Noticing Leela’s 39 on her, Jenny had an exciting feeling from her heart: “See, I don’t have any language barriers here. We 40 speak and communicate!” At that moment, she understood: we’re all simple human, and we have the ability to connect with each other.
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