题目

The alarm went off about half an hour ago, the second time tonight. It's somewhat difficult to figure out the rules for sure. Here, one bell means 'elephant', two, 'rhino' (犀牛), and three and four, I really can't remember for what, because when you're awoken by bells in the middle of the night, your first thought won't be 'Animal! '. But as soon as I realized it was the rhino alarm, I was running for the stairs.A baby African buffalo and a baby rhino stood a couple feet apart, staring at each other. Behind them, their mothers were looking on with the kind of indifference of mothers everywh除去氯化氢气体中混入的少量氯气，所选用的溶液是 [　　] A．KI溶液B．NaOH溶液 C．含KI的浓盐盐酸D．饱和食盐水