题目

完形填空。 When Mary Smith was a    1    , she wanted to be a teacher,    2    she liked children. When she was twenty, she began teaching in a small school. She was a good teacher, and she    3    a lot with the children in her class. They    4    her teaching. One day,    5    of the girls in her class said to her, Miss Smith,    6    does a man's hair become grey before his beard (胡子)does? Mary laughed and answered, I don't know. Helen, do you know? I don't know    7    , Miss Smith, said Helen, but it happened to my father. The  �把8平均分成4份，求每份是多少？列式正确的是（ ）A. 8×4 B. 8-4 C. 8÷4