题目

One day when some government officials were rebuilding a barn（谷仓）, they found a mouse hole in a corner and used smoke to force the mice inside the hole to come out. A while later they indeed saw mice running out, one after another. Then, everyone thought that all the mice had escaped. But just as they began to clean up, they saw two mice squeezing（挤）out at the mouth of the hole. With some efforts, the mice finally got out. However, it was strange that after they came out of the hole, they did not run away at once. Instead, one chased after the other near the mouth of the 关于酒精消毒的原理是A．溶解作用     B．还原作用      C．盐析作用         D．变性作用