This episode's headline: Standoff; Speaker Under Fire; Placing Blame; AIDS On Campus. The guests include CHAO JINGLUN, China Daily News, New York; SUN YOUGENG, China Daily, Beijing; JUNE TEUFEL DREYER, University of Miami; ARTHUR HUMMEL, Former U.S. Ambassador to China; DR. RICHARD KEELING, American College Health Association; REPORTS FROM NEWSHOUR CORRESPONDENTS: JEREMY THOMPSON; ROGER MUDD; LEE HOCHBERG. Byline: In New York: ROBERT MacNEIL; In Washington: JUDY WOODRUFF