Coffee became popular among middle class workers because__________A、it had a peculiar flavor
B、it could make them feel relaxed
C、it was the only drink they could afford
D、it could help sharpen their mental faculties
【正确答案】：D
【题目解析】：细节判断题。题干问为什么中产阶级工人喜欢咖啡。最后一段中提到Its popularity owed much to the growing middle class of information workers…who … found that coffee, sharpened their mental faculties. 故而D选项为正确答案。