题目

Your shoes are _______. A. where they were                 B. the place you put C. in the corner that you put       D. there where they are 答案：A交警通过酒精检测仪显示的颜色变化，可快速检测出司机是否酒后驾车，其反应原理为：，该反应中x的化学式为________，其依据是________________。