Beijing shut down parks, shopping malls and museums on Tuesday. At the same time, more Chinese cities resumed mass testing for Covid-19 as China fights a spike in cases, deepening concerns about its economy and dampening hopes for a quick post-coronavirus reopening. China reported 28,127 new local cases nationally for Monday, nearing its daily peak from April, with infections in the southern city of Guangzhou and the southwestern municipality of Chongqing accounting for about half of the total.