根据以下材料，回答
As with spoken language, writtenlanguage is always used for a purpose. People read a text 11 they think that it will enable them tofind answers to questions that they are interested in answering. People writeto express an 12 or to give information to particularreaders. There are, of course, many different purposes for reading and writingand different purposes will 13 different reading and writing styles.
In general, written language isstructurally more "correct" than spoken language. It has clear wordand sentence 14 and its information is more denselypacked. More is said in 15 words. However, written language alsocontains both structural and contextual redundancy and this can help readers to 16 the text.
Written language is often structurally more 17 than spoken language. This is becausewhen people write they have 18 to think about what they want to writeand are able to 19 to what they have written and revise itas often as they wish. This greater, structural complexity is one factor that maymake a text 20 to understand.
When people read in their first language,they do not usually read every word in the text. Readers 21 their eyes across and down the textstopping at groups of words (fixations) to check for meaning. The speed withwhich people read 22 their purpose for reading and on how 23 a range of possible meanings their brainhas to choose from at every fixation. 24 readers use the structuraland contextual redundancy of the language, their 25 of what they have already read and thegeneral knowledge they already have to 26 what will come next, and so 27 the number of possible choices that thebrain has to consider at any fixation.
Both writers, when choosing how to expresstheir 28 meaning for the audience that they have inmind, 29 readers, when interpreting writers′meaning, rely not only on their linguistic knowledge, but 30 their general knowledge of the context inwhich they are reading
考查逻辑关系。空格前后是两个完整的句子，所以首先排除A项。根据句意可知，空格前后为因果关系，并且是前果后因，because符合句意，故选B。
我国保护少年儿童权益的专项法律是《中华人民共和国未成年人保护法》。（ ）
MP3（ ）。
计算机软件是指（ ）。
下面哪一项不属于维护交易安全原则的内容？（ ）
围绕《建国以来的重大科技成就》一课，做一个教案。
请围绕“城乡发展一体化”写一篇小论文，题目自拟，角度不限，要求：结构完善、条理清晰、有说服力。
在国际关系中，第三世界国家历来是中国团结合作的对象，因为 ①第三世界国家是国际社会一支重要的政治力量 ②团结第三世界国家符合中国的国家利益 ③合作是第三世界国家共同发展的必由之路 ④第三世界国家在南北关系中处于主导地位（ ）
微观经济学要解决的问题是（ ）
机关文书部门或业务部门在年终或第二年上半年对归卷的文件材料进行整理等工作，称为（ ）。
20世纪70年代中国外交有了重大突破和转机，转变的关键是（ ）
