喜马拉雅山的成因是（　　）

喜马拉雅山的成因是（　　）

    Having been walking in the snow for 2 hours, Little Buddy was really tired and frustrated. The way home seemed1each step a struggle. For fall every little distance that Buddy gained, he seemed to fall back even further, pushed by the rising wind and his own2 When Buddy had to go uphill, he looked with3at the long distance remaining and thought he wasn't going to make it. His legs had been pushing through almost-waist-high4for hours, and all he wanted to do was to 5down, to end this terrible journey and close his eyes.

    Suddenly, there was someone6him. A large man was looking down at Buddy, smiling at him7 Buddy, should have heard the sound of the man's boots crunching(使……发出嘎吱嘎吱声)the snow8he'd walked up from behind. But, there hadn't been a9.

    Buddy stared at the10.Who was he? There was a scarf hiding most of his face, but11Buddy felt no fear of him. The man said nothing. He simply picked Buddy up, lifted him over his12set Buddy on his shoulders and began to13.

    Buddy told the man where he14.As they approached the house, the stranger 15and looked Buddy in the eye. Buddy16and the man silently lowered his head and helped Buddy17off his shoulders. Buddy was so happy that he immediately knocked at the door. When Buddy18the man and wanted to thank him, he had already19Buddy could only see20in the snow and a dim(模糊的)view of his back.