题目

All things ___, the planned trip will have to be called off. A. considered    B. be considered C. considering        D. hating considered 答案：A橙花醛可作香料，其结构简式为：(CH3)2C=CHCH2CH2C(CH3)=CHCHO。下列关于橙花醛的说法正确的是A．橙花醛不能与溴发生加成反应B．橙花醛可以发生银镜反应C．1 mol橙花醛最多可以与2 mol氢气发生加成反应D．橙花醛是乙醛的同系物