小檗碱属于
A．吡啶类生物碱B．莨菪烷类生物碱C．异喹啉类生物碱D．吲哚类生物碱E．有机胺类生物碱
参考答案：C
Had it been possible I would have gone to the movies but I________ busy. [ ]
A. had been
B. am
C. was
D. would be
青春期心理健康维护的方法有（）
A、以人为本，从关爱出发
B、少说道理，多倾听
C、奖励和惩罚时只对行为不对人
D、专门讲道理给学生听
