题目

进行社会调查，首先要有明确的（ ） A . 调查主题 B . 调查提纲 C . 调查对象 D . 调查方法 答案：A—I wonder why he has been acting so strangely these days.— Recent pressure at work may ________ his behavior.A. account for B. make forC. stand for D. change for