This episode's headline: China Relations; Rush to Market?; Salmon Rescue; Dialogue. ANCHOR: JIM LEHRER; GUESTS: BETTE BAO LORD, Author; DORIS KEARNS GOODWIN, Presidential Historian;MICHAEL BESCHLOSS, Presidential Historian;HAYNES JOHNSON, Journalist/Author; DR. MICHAEL FRIEDMAN, Acting Commissioner, FDA;DR. SIDNEY WOLFE, Public Citizen; SISSELA BOK, Author, ""Mayhem""; CORRESPONDENTS: MARGARET WARNER; PHIL PONCE;KWAME HOLMAN; ELIZABETH FARNSWORTH; LEE HOCHBERG; SPENCER MICHELS; DAVID GERGEN