Kitty is a lovely girl. Today she goes to the city to visit her aunt. There are so many hotels and restaurants in the city. She can't find the way to her aunt's house. She is lost. She wants to cross(穿过)the street. But there are too many buses and cars. She feels afraid. She stops in the middle(中间). A policeman comes and helps her to cross the street. Then he tells(告诉) Kitty how to get to her aunt's house. Kitty says“thank you”and then she gets there safely(安全地). Both(两者都) Kitty and her aunt are happy.

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下列句子在修辞运用上与其他三句不同的一句是 (       )

“小时候，妈妈为我洗脚；长大后，我为妈妈洗脚。”从法律角度看，这句公益广告词体现了（   ）