Three years before the Los Angeles Olympic Games. Michael Yessis, PhD. believes the United States has as much chance of garnering the lion's share of the medals as Albania or Zambia. The professor of physical education at California State University, Fullerton, and publisher o f the Soviet Sports Review told McGraw-Hill World News reporter Paul Addison that he is not a pessimist or communist. He just doesn't expect any nation to match the excellence of the scientifically trained Soviet athletes. Yessis writes here for a change in attitude toward learning from the Russians.