后备母猪，10月龄，未见发情，应选用的催情药物是（）（P425-32）
A、缩宫素
B、丙酸睾酮
C、垂体后叶素
D、呋塞米
E、雌二醇
参考答案：E
----Where have you been?
---- I _______ stuck in the traffic. I ________ here earlier.
A．had got; would have been
B．have got; would be
C．got; had done
D．got ; would have been
悬浮颗粒物
