高考英语语法填空题解题技巧与方法

which are about 80 miles apart, police said. (2007梅州二模)

（三）括号中所给词有可能是要求词义转换，词类不一定要变，主要是考查具有与词根意义相反的派生词，需根据句子意思及前后逻辑关系，在词根前加un—, im—等，在词根后加—less等。如：

[例1] People certainly have a variety of reasons for going back to school

but one important thing to know is, no knowledge is ________ (use).

[例2] Your mistake caused a lot of ________ (necessary) work in the office.