【单选题】We have become so used to defending ourselves against the new atmosphere of American life, so used to putting ________ barriers, that we have not had time to think about what it may mean.
【简答题】For that is what has happened. We have become so used to defending ourselves against the new atmosphere of American life, so used to ___(17)___, that we have not had time to think about what it may me...
【简答题】We have become so used to defending ourselves against the new atmosphere of American life, so used to putting up b_______(障碍) , that we have not had time to think about what it may mean.