66. The findings of the experiment show that _________.

   A. errors are more likely when a referee keeps close to the ball

   B. the farther the referee is from the incident，the fewer the errors

   C. the more slowly the referee runs，the more likely will errors occur

   D. errors are less likely when a referee stays in one Spot

【解析】A. 本题涉及实验结果，第四段第二句即是本题答案依据。