[单项选择]Participation in high school sports is not a constitutional right (62) , it is a privilege, paid for by taxpayers, open to students who promise to (63) certain conduct requirements on and off the field. One of these (64) is to refrain (抑制) from using drugs.
Drug (65) is a serious problem among high school students. Studies show that as many as 500,000 high school students use muscle-pum ping, life-destroying (66) such as steroids (类固醇). Many more use illegal drugs, which cause discipline problems and (67) the stage for lifelong addictions.
Drug testing works to prevent and (68) use. That is why drug testing is required when athletes compete in the Olympics and the National Football League. (69) drug testing was instituted by these organizations, use of performance-enhancing drugs has been greatly (70) . We should want nothing (71) in schools. (72) , many athletes support testing pr