Imagine that you’re participating in one of my “Comic Book Jeopardy!” quizzes . . . .   Under ‘Silver-Age Avengers Tenures’ for $50, the answer is . . . . “This hero left the Avengers only five issues after being made a member.”   The clock is ticking, folks.  Anybody want to take a stab at it?   Whenever comic-book fans gather together, either in person or on line, they love to compare preferenc…