【正确答案】 B

【答案解析】[解析] 从文章可得知她是因为7个月大的时候的一场疾病而失聪失明的。故本题答案为B。
[听力原文] <17>-<20>.
Helen Keller lost her sight and hearing of a sickness at the age of 19 months ,even before she had learned to talk. For the first seven years of her life she was like a wild animal. She wanted other people to communicate. Finally her parents sent for a teacher, Miss Ann Sullivan. Ann taught her how to learn the world through touch and smell and feeling, and eventually she became a teacher, writer and lecturer.

【正确答案】 A

【答案解析】[解析] 文章中提到7岁以前和7岁以后的对比，正是从7岁开始有老师教她。故本题答案为A。

【正确答案】 B

【答案解析】[解析] 文章的最后一句话提到她成为了老师和作家。故本题答案为B。 ．

【正确答案】 C

【答案解析】[解析] 从文章可知，这都是缘于从7岁起有了老师的帮助。故本题答案为B。