Two giant panda bears from China arrived Tuesday at the U.S. national zoo in Washington, less than a year after Americans bid a fond farewell to three of the rare species. The arrival of the new pair of 3-year-old giant pandas, Bao Li and Qing Bao, comes at a time when relations between the two countries remain fraught with tensions. The Smithsonian’s National Zoo and Conservation Biology Institute said the bears are scheduled to go on view for the public on Jan. 24. The sooner-than-expected return of the beloved bamboo-chewing species to the Washington zoo took place as the United States prep…