A、Their friends’ great help. B、Their teacher’s love. C、Their parents’ good guidance. D、Their teacher’s magic formula. B细节题。文章结尾提

A college professor had his sociology class go into the Baltimore slums to get case histories of 200 young boys. They were asked to write an evaluation of each boy’s future.[33]In every case the students wrote, "He hasn’t got a chance to be successful. " 25 years later another sociology professor came across the earlier study. He had his students follow up on the project to see what had happened to these boys.[34]With the exception of 20 boys who had moved away or died, the students learned that 176 of the remaining 180 had achieved more than ordinary success as lawyers, doctors and businessmen.
    The professor was astounded and decided to pursue the matter further. Fortunately, all men were in the area and he was able to ask each one "how do you account for your success". In each case the reply came with feelings, "There was a teacher. " The teacher was still alive, so he sought her out and asked the old but still alert lady what magic formula she had used to pull these boys out of the slums into successful achievement.[35]The teacher’s eyes sparkled and her lips broke into a gentle smile, "It’s really very simple, " she said. "I loved those boys. "
32. Why did the first professor send his sociology class to the Baltimore slums?
33. What was the students’ evaluation about the future of the boys in the slums?
34. What happened to the boys in the slums 25 years later?
35. What accounted for the change of the boys’ destinies?