[单选题]根据以下材料，回答
Aswithspokenlanguage,writtenlanguageisalwaysusedforapurpose.Peoplereadatext11theythinkthatitwillenablethemtofindanswerstoquestionsthattheyareinterestedinanswering.Peoplewritetoexpressan12ortogiveinformationtoparticularreaders.Thereare,ofcourse,manydifferentpurposesforreadingandwritinganddifferentpurposeswill13differentreadingandwritingstyles.
Ingeneral,writtenlanguageisstructurallymore"correct"thanspokenlanguage.Ithasclearwordandsentence14anditsinformationismoredenselypacked.Moreissaidin15words.However,writtenlanguagealsocontainsbothstructuralandcontextualredundancyandthiscanhelpreadersto16thetext.
Writtenlanguageisoftenstructurallymore17thanspokenlanguage.Thisisbecausewhenpeoplewritetheyhave18tothinkaboutwhattheywanttowriteandareableto19towhattheyhavewrittenandreviseitasoftenastheywish.Thisgreater,structuralcomplexityisonefactorthatmaymakeatext20tounderstand.
Whenpeoplereadintheirfirstlanguage,theydonotusuallyreadeverywordinthetext.Readers21theireyesacrossanddownthetextstoppingatgroupsofwords(fixations)tocheckformeaning.Thespeedwithwhichpeopleread22theirpurposeforreadingandonhow23arangeofpossiblemeaningstheirbrainhastochoosefromateveryfixation.24readersusethestructuralandcontextualredundancyofthelanguage,their25ofwhattheyhavealreadyreadandthegeneralknowledgetheyalreadyhaveto26whatwillcomenext,andso27thenumberofpossiblechoicesthatthebrainhastoconsideratanyfixation.
Bothwriters,whenchoosinghowtoexpresstheir28meaningfortheaudiencethattheyhaveinmind,29readers,wheninterpretingwriters′meaning,relynotonlyontheirlinguisticknowledge,but30theirgeneralknowledgeofthecontextinwhichtheyarereadingandwriting.Suchknowledge,whetherspecificallylinguisticorcontextual,isstoredinthelong-textmemory.