In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
With the implementation of (1) , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (2) interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be (3) . For example, one computer may be a small single - user computer, while another may be a large (4) system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Netwo
A. database
B. data representation
C. protocols
D. data communication
One of the difficulties in building an SQL-like query language for the Web is the absence of a database (131) for this huge, heterogeneous repository of information. However, if we are interested in HTML documents only, we can construct a virtual schema from the implicit structure of these files. Thus, at the highest level of (132) , every such document is identified by its Uniform Resource Locator (URL), and a (133) and a text. Also, Web severs provide some additional information such as the type, length, and the last modification date of a document. So for data mining purposes, we can consider the set of all HTML documents as a relation:
Document (url, rifle, text, type, length, modif)
Where all the (134) are character strings. In this framework, an individual document is identified with a (135) in this relation. Of course, if some optional information is missing from the HTML document, the associate fields will be left blank,
A. protocol
B. control
C. abstraction
D. presentation
“世界读书日”倡导青少年要“读书好、好读书、读好书。”青少年要“读好书”，这是因为（）
①青少年是民族的未来、祖国的希望
②好的书籍能使人战胜一切艰难困苦
③文化既是一种精神力量，又是一种物质力量
④优秀文化能促进人的全面发展
根据以下资料，回答116-120题。
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