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1. Introduction
As Nunan （1991） points out that before teachers adapt materials， it is important to consider that many materials are well designed by publishers， and the material may useful and helpful in a suitable context， such as in my home country， published materials both in middle schools and senior high schools are edited every year， which is in order to address some problems from these materials and then provide a kind of fairly ideal ones to students. However， on the other hand，
“Published materials of any kinds have to cater for a very wide range of possible users， which means that they cannot address any individual student or group of students directly” （White 1998， p.73）.
So in McDonough
As Nunan （1991） points out that before teachers adapt materials， it is important to consider that many materials are well designed by publishers， and the material may useful and helpful in a suitable context， such as in my home country， published materials both in middle schools and senior high schools are edited every year， which is in order to address some problems from these materials and then provide a kind of fairly ideal ones to students. However， on the other hand，
“Published materials of any kinds have to cater for a very wide range of possible users， which means that they cannot address any individual student or group of students directly” （White 1998， p.73）.
So in McDonough