After a serious earthquake happened,a father left his wife safely at home and rushed to his son's school,only to find that the building where his son studied had collapsed and looked like a pancake.
He was shocked. He didn't know what he should do for a while,then he remembered the words he had said to his son,"No matter what happens,I'll always be there for you！"And tears began to fill his eyes. He started digging through the ruins （废墟）。
As he was digging,other helpless parents and the firemen arrived and tried to pull him off the ruins,saying,"It's too late!They're all dead!There's nothing you can do!"To them he replied with one line,"Are you going to help me now?"And then he kept on digging.
No one helped,however. He went on alone because he needed to know for himself:"Is my boy alive or is he dead?"He dug for eight hours. . . 12 hours. . . 24 hours. . . 36 hours. . . then,in the 39th hour,he pulled back a rock and heard his son's words. He shouted his son's name,"ARMAND!"He heard back,"Dad！It's me,Dad!I told the other kids not to worry. I told them that if you were alive,you'd save me and when you saved me， they'd be saved. You promised， 'No matter what happens， I'll always be there for you！' You did it,Dad!"
"What's going on in there?How is it?"the father asked.
"There are 14 of us left out of 33,Dad. We're frightened,hungry,thirsty and thankful you're here. When t he building fell down,it made a triangle （三角），and it saved us. ”
"Come out,boy!"
"No,Dad!Let the other kids out first,because I know you'll get me!No matter what happens,I know you'll always be there for me!"
46. The underlined word “collapsed” probably means".
A. break down B. shake away C. stand by D. fall into
47. Who came to help the father when he was digging？
A. His wife. B. Other parents. C. The firemen. D. No one.
48. Other parents and the firemen wanted to pull him off the ruins because they thought.
A. he was mad B. all the children had died in the earthquake
C. he was too dangerous to others D. it was not his job to dig
49. How many students were already dead when the father found them in the ruins？
A. Fourteen. B. Thirty-three. C. Forty-seven. D. Nineteen.
50. We can learn from the passage that.