SCMP China desk reporter Holly Chik looks at how mass testing and lockdowns are affecting Beijing and Shanghai. Video reporter Thomas Yau reports on ongoing stress and anger of residents in Puxi district over food supplies, and the shocking videos evading social media censorship. Amanda Lee in Beijing and Siji Ji in Shenyan analyse the economic data and discuss the silencing and disappearance of a prominent Chinese economist who criticized Beijing's harsh zero Covid policies as concerns mount…