The idea seems sort of foolish, just another exercise trick. Stand for a few minutes on a platform that vibrates. Get off and tr

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问题     The idea seems sort of foolish, just another exercise trick. Stand for a few minutes on a platform that vibrates. Get off and try to do some weight lifting. Or see how high you can jump. You are【C1】______supposed to be able to lift heavier weights and jump higher.
    But maybe it’s not so【C2】______, exercise experts say. Although they don’t really know why vibrations should work, researchers report that they actually seem to slightly improve【C3】______in the few minutes after a person gets off the machine.
    The problem,【C4】______, is that there is little【C5】______on how fast the vibrations should be or in what direction platforms are【C6】______to vibrate. Some studies have【C7】______to show any effects from vibrations. And then there is the question of【C8】______exactly vibrations are doing to muscles and nerves.
    "It【C9】______is arousing interest, and a large portion of the【C10】______would support that something is happening," said Lee E. Brown, an expert at California State University. But he added, "We are still trying to【C11】______exactly what the mechanism is."
    Meanwhile, several companies make the vibrating platforms, and they are being used at gyms and【C12】______some athletes. One company, Power Plate,【C13】______that stars like Serena Williams and Justin Morneau, of the Minnesota Twins, train with its【C14】______. Another company, Wave, says the United States ski team used its vibrating plates in training【C15】______the coming Winter Olympics.
    But researchers are【C16】______. "There is something to it," said William J. Kraemer, a professor at the University of Connecticut,【C17】______it "another tool" for athletic conditioning. But he added that other conditioning methods might【C18】______the same or better results. Researchers say, people should be appropriately skeptical about the effects of standing on a vibrating platform. "We don’t know a lot about prescribing it," Dr. Kraemer said. "There’s the【C19】______. Research is trying to【C20】______up."
【C3】

选项 A、persistence
B、endurance
C、resistance
D、performance

答案D

解析 上下文语义题。从第一段最后一句得知,从振动台下来之后,能举起更重的重量、跳得更高,这可简单概括为“表现”。再根据空格前的slightly improve,推断此处提及的也是“改善表现”,故D项performance“表现”最为合适。
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