China’s Xu Mengtao finally picked up an Olympic gold at her home Beijing Winter Games on Monday when she leapt to victory in the women’s freestyle skiing aerials. The 31-year-old, who picked up silver in Sochi 2014 and in the Beijing mixed team event, went one better after leaving her very best jump to last. She managed a score of 108.61 following a back full-full-full with Belarusian 2018 champion Hanna Huskova taking silver and Megan Nick of the US bronze. Ashley Caldwell, who helped the US to gold in last week’s mixed team event, had looked on course for gold after impressing in the first f…