China and South Korea, which had early, intense outbreaks of the coronavirus, together reported only four new infections Tuesday and were slowly resuming public events after months of containment efforts. Meanwhile, the U.S. was taking halting steps to lift some restrictions even as thousands of new cases continue to be reported each day. In Washington, the Supreme Court heard arguments by telephone and allowed the world to listen in live for the first time. And the Senate convened for the first time since March, though prospects for quick action on a new aid package are uncertain.