【正确答案】 A

【答案解析】[听力原文] Officials in China say they've rescued almost 90 children from trafficking rings operating across several provinces. More than 350 people suspected of involvement in the crime were arrested over the past few days. Officials said they would now try to find the parents with the help of a national DNA database of genetic samples designed to help child trafficking. 新闻结尾处提到在a national DNA database of genetic samples可以帮助官方找到得救儿童的父母。