阅读下面短文，从题中所给的 A、B、C、D四个选项中选出最佳选项。
One morning, I was on the underground going to work. A voice came from the speaker(喇叭). It said, "This1 is Shady Grove Park." I heard a little voice repeat(重复) it and then I looked 2 . A young girl said it again, "This stop is…"3 and slowly, and with a little roll of her hand, she said it over and over again. It was like she was 4 a little child.
Then I understood. She wasn't teaching a child. She was teaching her 5 ! I listened and heard the mother6 someone in English. She said that she was Japanese and that she was learning 7 from her daughter. The mother could talk in English, but she8 had a long way to go. Being Japanese, she said that she found it not easy for her to 9 "th" and" t" clearly. Luckily, her daughter was very patient(耐心的). When she 10 got them right, her daughter smiled and gave her a high 11 .
At the next stop, the mother said the name of the stop with12 pronunciation, "This stop is the Railroad Station."
It was a lovely start to 13 day. All day, I thought of that girl and her mother and felt14 . The girl could speak three languages — Japanese, English, and Spanish. And she could speak English as well as native speakers! With a(n)15 , she taught her mum English very patiently all the way. Most special, however, was the mother's willingness(意愿) to learn from her daughter.
