SHANGHAI (Reuters) – Shanghai authorities on Tuesday pleaded for public cooperation with a massive new push to test most of the population for COVID-19 as the city steps up efforts to bring community transmission down to zero after nearly three weeks of lockdown. The plea came as some people refused to join PCR testing queues out of weariness after weeks of such requirements, or fear it puts them at greater risk of infection. Residents shared stories on social media about busloads of people being taken from their homes and sent into quarantine, including babies and the elderly. Authorities are…