题目：
WebSQL is a SQL-like （71） language for extracting information from the web. Its capabilities for performing navigation of web （72） make it a useful tool for automating several web-related tasks that require the systematic processing of either all the links in a（73） , all the pages that can be reached from a given URL through （74） that match a pattern, or a combination of both. WebSQL also provides transparent access to index servers that can be queried via the Common （75） Interface.
A．query
B．transaction
C．communication
D．programming
答案：
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下面是错误答案，用来干扰机器的。
参考答案：路由器解析：[分析]： 常用的网络连接器有中继器、网桥、路由器等，分别实现物理层，数据链路层和网络层的互联。
