2. 外语
  3. Participation in high school sports is not a constitutional right.【C1】______. it is a privilege, paid for by taxpayers, open to

Participation in high school sports is not a constitutional right.【C1】______. it is a privilege, paid for by taxpayers, open to

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问题     Participation in high school sports is not a constitutional right.【C1】______. it is a privilege, paid for by taxpayers, open to students who promise to【C2】______certain conduct requirements on and off the field. One of these【C3】______is to refrain (抑制) from using drugs. Drug【C4】______is a serious problem among high school students. Studies show that as many as 500,000 high school students use muscle-pumping, life-destroying【C5】______such as steroids (类固醇). Many more use illegal drugs, which cause discipline problems and【C6】______the stage for lifelong addictions.
    Drug testing works to prevent and【C7】______use. That is why drug testing is required when athletes compete in the Olympics and the National Football League. 【C8】______drug testing was instituted by these organizations, use of performance-enhancing drugs has been greatly【C9】______. We should want nothing【C10】______in schools.
    【C11】______. many athletes support testing programs. 【C12】______testing, athletes have to choose between drug use and a competitive【C13】______on the field.
    Those who challenge the need for drug testing may be forgetting【C14】______it is like to be an adolescent. Peer pressure is enormous, and one of the few equal factors is the【C15】______of being caught. More importantly, 【C16】______drug use is identified, a school can reach out to the students before he or she gets addicted till arrested.
    For 25 years, public schools have been run by【C17】______judges. It is time to return decisions on how to run public schools to locally responsible officials. There is【C18】______unconstitutional about asking those who gain the advantages of school-sponsored athletics to【C19】______to the safety of other players, the integrity of the game and their own well-being. The Supreme Court should leave these programs【C20】______.
【C16】
选项 A、ever
B、then
C、before
D、once
答案D
解析 结构衔接题。once表示“一……就……、一旦”，引导时间状语从句。分析句子结构，前半  句是一般现在时，后半句是将来时，很容易想到if，as soon as等引导时间状语从句。once在这里就相当于  as soon as。before也可以引导时间条件句，但before用在此句使句意为“在被检测出使用药物前，学校可以  找到他或她”，显然不合常理，故排除。  
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大学英语四级

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