根据上下文及首字母提示完成短文。（每空一词）

      Eric is a good boy. He is 15 1. y____________ old. He is a student in No. 50 Middle School. He has

2. m____________ friends. He likes going to 3. m____________. He likes 4. w____________ TV, too.

He often 5. w____________ football games on TV. His 6. f____________ football star is Beckham. He

wants to 7. b____________ a football player. He thinks playing football is very 8. e____________. Eric

9. h____________ a sister Kathy. She 10. d____________ like football. She likes painting very much.

消退抑制在运动训练中有什么作用？