第21题: [单项选择]My boss insists on seeing everything in ______ before he makes a decision. A. black and blue B. red and blue C. black and white D. green and yellow 参考答案:C 答案解析:[解析] A项black and blue意为“青肿的;淤血的”,与上下文意思不符。C项black and white意为“白纸黑字,黑白分明,清清楚楚”,符合本句的意思,为正确答案。其他两项不是习惯