干粉灭火器能迅速扑灭液体火焰，同时泡沫能起到（）。
参考答案：及时冷却作用
蝗虫、蛙、鸟在生殖发育上的共同点是
A．交配
B．蜕皮
C．受精
D．变态发育
In fact, I would have left for the countryside ____ have stayed at home. [ ]
A. more than
B. other than
C. rather than
D. less than
