A:①②
B:①②③
C:②③
D:②③④
①都是白色固体 ②都极易溶于水放出大量热③溶液都使无色酚酞试液变红 ④都能和酸发生中和反应 ⑤溶液中通入CO2都变混浊.
Jumping out of ______ airplane at ten thousand feet is quite ______ exciting experience.