题目

脑白金主要成分的结构简式如下图所示，对脑白金主要成分的推论正确的是 A. 其分子式为C13H15N2O B. 该物质能发生水解反应并生成乙酸 C.该物质不能与溴水反应       D.其官能团与氨基酸相同   答案：B 解析: 略The days ____we spent together on the farm are not easy ______． A．when, to forget                                         B．which, to be forgotten C．that, to forget                                            D．/, to be forgotten