A goofy comedy about mermaids and a fantasy starring a “monkey king” have propelled China’s box office to a massive $1 billion monthly haul that eclipsed sales in North America for the first time. Chinese theaters took in a record 6.87 billion yuan ($1.05 billion) in February, the official state news agency Xinhua reported. That compares with $797 million in North America, where 20th Century Fox’s “Deadpool” delivered a strong ...