3.逻辑错误。
这种错误一般得根据上下文判断得出，分析这么多年六级改错的逻辑错误，答案无一例外都是将文中某个用错的词(很多情况下是一个形容词)改成它的反义词或添上一个否定词，这里要求同学们掌握一些常用的否定词缀，如in-、un-等等，因为有的形容词加上否定词缀就变成了它的反义词,举例如下：
(1)the leaders of our country are unconsciously
sending the message that reading may be connected
to desirable activities that…(07年1月新六级改错第七题)desirable>undesirable
(2)The task of learning facts and concepts, one at a
time, makes learning laborious, boring and efficient.
(07年1月老六级改错第八题)efficient> inefficient.本题中
efficient和laborious与boring并列,根据并列成分意思一致原则,也可以推断出这里的efficient应该换成它的反义词.
(3)But in the Information Age, no one can get by
with knowing how to read well and understand
increasingly complex material.(06年6月六级改错第十题)with>without.这里句子主语用了no one表示否定,而整个句子表示肯定的意思,所以后面必然要用一个否定词without
与no one构成双重否定表示肯定。
(4)Initial impressions are vital, and a badly presented
CV could mean acceptance, regardless of what's in
it.(06年1月六级改错第三题)acceptance>rejection
(5)the person who is unfamiliar with the arts, music,
literature, philosophy, or history.(04年6月六级改错第六题) unfamiliar>familiar
(6)Except for relatively-isolated trouble spots like
present-day Somalia, and occasional years of good
harvests, the world's food crisis has remained just
around the corner.(04年1月六级改错第四题)good>
poor/bad
(7)Get someone to check for spelling and grammatic-
al errors, because a spell-checker will pick up every
mistake.(06年1月六级改错第6题)根据上下文,这里应该表示“不能挑出每个错误”，所以在pick up之前要加上否定词not.