第16题: [单项选择]Some of us find it difficult to think in imaginative and flexible ways because ofour _______ pattern of approaching problems. A. set B. common C. popular D. hard 参考答案:A 答案解析:set指“固定的;不变的,固执的,循规的”,符合句意;common“普通的”;popular“流行的,大众化的”; hard指“艰难的,坚硬的”。