A man killed a woman and then shot himself on a busy street in Flushing, Queens, on Monday after they had an argument, the police said.The police identified the man as Bin Xie, 51, and the woman as Ya Ling Meng, 46. Both were pronounced dead at the scene, the police said.The shootings took place around 5:30 p.m. on 41st Avenue near Main Street, a crowded intersection in a predominantly Chinese neighborhood. The pair were believed to have known each other, the police said.On Monday evening, the two bodies were lying on the sidewalk with white sheets covering them outside a beauty salon and a restaurant. A fast-swelling crowd gathered around the crime scene, and many people shared photos of the victims on WeChat, a Chinese social media app.The street was closed to traffic as the police questioned customers inside local businesses.A restaurant cook who lives on the same block and who identified himself by his surname, Zhang, said he heard two people arguing in Mandarin over the course of three hours on Monday afternoon as he went in and out of his building running errands. He said that he heard two loud shots, and that a woman at the beauty salon had called the police.A 43-year-old cook at a nearby restaurant who identified himself by his surname, Chen, said that after hearing a gunshot, he ran over in time to see a man fall over with “a lot of blood coming from his head.”A short time later, a woman was crying loudly as she crouched next to the bodies.