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  3. If you watched a certain swimmer’s Rio Games debut on Sunday night, when he propelled the United States 4×100-meter relay team t

If you watched a certain swimmer’s Rio Games debut on Sunday night, when he propelled the United States 4×100-meter relay team t

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问题    If you watched a certain swimmer’s Rio Games debut on Sunday night, when he propelled the United States 4×100-meter relay team to a gold medal, you know the answer: Michael Phelps. While it may look like the athletes have been in a bar fight, the purple dots actually are signs of "cupping," an ancient Chinese healing practice that is experiencing an Olympic moment.
   In cupping, practitioners of the healing technique—or sometimes the athletes themselves— place specialized cups on the skin. Then they use either heat or an air pump to create suction between the cup and the skin, pulling the skin slightly up and away from the underlying muscles. The suction typically lasts for only a few minutes, but it’s enough time to cause the capillaries just beneath the surface to rupture, creating the circular, eye-catching bruises that have been so visible on Phelps as well as members of the United States men’s gymnastics team.
   Physiologically, cupping is thought to draw blood to the affected area, reducing soreness and speeding healing of overworked muscles. Athletes who use it swear by it, saying it keeps them injury free and speeds recovery. Phelps posted an Instagram photo showing himself stretched on a table as his Olympic swimming teammate Allison Schmitt placed several cups along the back of his thighs. "Thanks for my cupping today!" he wrote.
   While there’s no question that many athletes, coaches and trainers believe in the treatment, there’s not much science to determine whether cupping offers a real physiological benefit or whether the athletes simply are enjoying a placebo effect. "A placebo effect is present in all treatments, and I am sure that it is substantial in the case of cupping as well," said Leonid Kalichman, a senior lecturer at Ben-Gurion University of the Negev in Israel. "A patient can feel the treatment and has marks after it, and this can contribute to a placebo effect."
   One 2012 study of 61 people with chronic neck pain compared cupping to a technique called progressive muscle relaxation, or PMR, during which a patient deliberately tenses his muscles and then focuses on relaxing them. About half the patients used cupping while the other half used PMR. Both patient groups reported similar reductions in pain after 12 weeks of treatment. Notably, the patients who had used cupping scored higher on measurements of well-being and felt less pain when pressure was applied to the area. Even so, the researchers noted that more study is needed to determine the potential benefits of cupping.
It can be inferred that a placebo effect occurs simply because______.
选项 A、it has been proved by science
B、patients have the expectation that it will be helpful
C、patients usually are athletes, coaches and trainers
D、it has an evident physiological effect
答案B
解析 推断题。根据题干关键词定位到文章第四段。根据该段第一句的“但是从科学上 不太能确定拔罐带来的，是生理上的切实益处还是心理上的安慰”和列昂尼德.卡利切 曼所说的“患者能感觉到治疗，而且会留下印记，这会起到安慰作用”可推断安慰作用发 生是因为，患者在心理层面有这样的期望——认为它会起作用。故B项为正确答案，同 时排除D项。A项与原文的there’s not much science to determine不符。C项和D项均不 是安慰作用发生的原因。故排除。
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