新鲜黄花菜中含有（），可造成胃肠道中毒症状，故新鲜黄花菜不能生吃。
A.秋水仙碱
B.氰苷
C.亚硝酸盐
D.砒霜
参考答案：A
柴油机转速超过最高额定转速时，会使柴油机发生飞车故障。
Maybe if I_____ science, and not literature then, I would be able to give you more help.
A．studied
B．wouldstudy
C．hadstudied
D．wasstudying
