WebSQL is a SQL-like (61) language for extracting information from the web. Its capabilities for performing navigation of web (62) make it a useful tool for automating several web-related tasks that require the systematic processing of either all the links in a (63) , all the pages that can be reached from a given URL through. (64) that match a pattern, or a combination of both. WebSQL also provides transparent access to index servers that can be queried via the Common (65) Interface.

（61）是（）

A.query

B.transaction

C.communication

D.programming