A、13 months old. B、13 days old. C、13 years old. D、30 months old. A细节题。本题考查事实细节。根据原文第二句话可知，外科医生Milagro在周三时举起这个13个月大的女孩的腿，宣布这场精细的手

Doctors have fully separated the fused legs of a baby girl who’s come to be known as Peru’s mermaid. Holding up the legs of 13-month-old Milagro Wednesday her surgeon, called the delicate procedure a true success. The medical team had planned to begin repairing the birth defect by opening her legs up to the knees but say the procedure exceeded doctor’s expectations. The girl’s legs had been fused together from her thighs to her ankles when she was born. Milagro, whose name means miracle was born with a rare congenital defect commonly known as mermaid syndrome, which occurs in one out of every 70,000 births. Her doctors say there are only 3 known cases of children with the condition alive in the world today.
Questions 3 and 4 will be based on the following news item.
3. How old is the girl known as Peru’s mermaid?
4. What’s the problem of the girl?