题目

Early one morning last February, I felt the bang of Tink’s paws as she landed on my legs. This is my __16__. I was fast asleep and she woke me up, which had __17__ happened before. She sleeps downstairs and never comes __18__ the bedroom.     I sat up feeling __19__ because I’d been out the night before. But I soon realized something was very __20__. The room was half-filled with a layer of white smoke, strange and alarming, __21__ in the air about three feet deep like a patch of whiter cloud.     I phoned the fire brigade(消防队), who told me to __22__ the house as quick4．若点P（m-2，m+1）在x轴上，则m的值为（　　）A．2B．-2C．1D．-1