填空。
“两个各种虎势儿一站,公鸡鹐架似的对起阵来。”这句话把____比作____。
下列各组物质,若不加指示剂则不能确定是否发生了反应的一组是( )
我将能确定一定会发生或者一定不会发生的事件叫做____
A stupid man tells a woman to shut up, while a wise man tells her that her mouth is quite beautiful _______ it is closed.