A:1−丁烯 > 丙烯
B:1,2−丙二醇 > 1−丙醇
C:异戊烷 > 新戊烷
D:邻羟基苯甲醛 > 对羟基苯甲醛
水稻在开花传粉季节,最不能使花顺利传粉的季节是( )
Could you ask her ____ (call) me back this evening?