15.
A。根据四个单词的意思和句意，可知选A。
65
There
was a woman in Detroit,
who had two sons. She was worried about them, especially the younger one, Ben, 1 he was not doing well in school. Boys in
his class made joked about him because he seemed so 2 .
The
mother 3 that she herself would have to get her
sons to do better in school. She told them to go to the Detroit Public Library
to read a 4 a week and do a report about it for her.
One day, in
Ben’s 5 , the teacher held up a rock and
asked if anyone knew it. Ben put up his hand and the teacher let him 6 . Why did Ben raise his hand? They
wondered. He 7 said anything, what could he possibly
want to say?
Well, Ben not
only 8 the rock; he said a lot about it. He
named other rocks in its group and even knew 9 the teacher had found it. The teacher and
the students were 10 . Ben had learned all this from
doing one of his book 11 .
Ben later went
to the 12 of his class. When he finished high
school, he went to Yale
University and at last
became one of the best doctors in the United States.
After Ben grew
up, he 13 something about his mother that he did
not know as a 14 .
She, herself,
had never learned how to 15 .