Mary, who is pretty, is a five-year-old girl and she wears a dress.
题干要求改为长句。
主语为Mary,five、pretty、wears a dress为她的三个特征,可运用定语从句和并列句将句子改为长句。
句意:玛丽很漂亮,是一个五岁的女孩,她穿着一件连衣裙。