中文摘要：

结合自定步调阅读与句子启动再认范式，探讨说明文阅读过程中因果序列的表征问题。研究包括3个实验，实验1的文本提供一个包括4个概念的因果链（如，A—B—C—D），文本最后设置包含概念A或概念B或概念C的句子，对概念D进行探测，结果发现，对于概念D的再认启动作用，概念C〉概念B〉概念A；实验2改变因果链的说明顺序，使之与因果链本身次序不一致，结果与实验1一致；实验3的文本分别介绍两条独立的因果链（如A—B—C；D—E—F），最后呈现包含概念A或概念D的句子，对概念C进行探测，结果发现，包含概念A的句子理解启动了相关因果链，使读者对随后呈现的概念C的再认反应加快。基于本研究结果，结合相关研究，本文尝试提出说明文文本表征的建构模式。

英文摘要：

Text comprehension is viewed as the construction of a mental representation of the situation described by the text. Based on the evidence from narrative comprehension, Zwaan et. al., （1995） have proposed an event-indexing model of text comprehension. According to the model, during comprehension, readers construct their representations from five indexes： time, space, causality, intentionality, and agent. Actually, these five indexes are corresponding to the framework of an event, and the model fits the comprehension of narrative that usually involves creating a mental representation of the states of affairs described by the text. In view of both theoretical consensus and the evidence from narrative text experiments, it is somewhat surprising that evidence for the construction and the structure of representation is not clear when comprehension of expository text is considered. There has been much less research using expository than there has been using narrative texts, and a major issue concerning these studies has been the effect of knowledge map on the processing of expository. During expository comprehension, knowledge map was more helpful for the participants who without interrelated domain knowledge than the participants who with some interrelated domain knowledge in the construction of the representation. Based on the systematic analysis of previous theories and evidences from text reprehension in the reading of narrative and expository text, it raised a question that whether the construction of text representation can be realized in expository comprehension like that in the narrative reading. This research was designed to throw some light on the question. We examine the status of construction and the structure of mental representation of expository text about familiar topics. Three experiments were conducted. Experiment 1 was to explore whether participants construct the representation of causal sequence presented in the expository. Experiment 2 varied the order of the description to make it differ f