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

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."
【C16】
选项 A、alert
B、controversial
C、confused
D、confident
答案A
解析 上下文语义题。句首的But表明本句与上文存在转折关系，上一段提到运动员用振动机来训练，暗示该仪器的确具有一定的效果，本句应与此意相反，且结合本段下文提到的“研究人员说人们应该对振动机的效果保持适当的质疑”(skeptical about)可知，本段内容是对振动机效果的怀疑，故填入A项alert，表示“研究人员很警惕”。B项controversial意为“有争议的”，文中说的是振动机的效果有争议，而非研究人员具有争议，故予以排除。由下文可知，研究人员的态度很明确，故不能说是confused“疑惑的”，排除C项。D项confident“自信的”为反向干扰。
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