2.句际之间的逻辑关系。完形填空中,句际之间的逻辑关系主要包括:并列关系连接词有and, while等;转折关系连接词有but,however,though,whereas,nevertheless等;因果关系连接词有so,therefore,thus,because,for,since,as等;让步关系连接词有though,although,despite,in spite of等;条件关系连接词有if,unless,once,provided that,in case of等;解释关系连接词有that is to say,in other words等;顺序关系连接词有before,after,and,first,second,then,next,finally等。