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  3. Whether mobile phones can cause cancer remains an open question. But they are also accused by some of causing pain. A growing nu

Whether mobile phones can cause cancer remains an open question. But they are also accused by some of causing pain. A growing nu

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问题     Whether mobile phones can cause cancer remains an open question. But they are also accused by some of causing pain. A growing number of people around the world claim to be "electrosensitive", in other words physically responsive to the electromagnetic fields that surround phones and the other electronic devices that disorder the modern world. Indeed, at least one country, Sweden, has recognized such sensitivity as a disability, and will pay for the dwellings of sufferers to be screened from the world’s electronic smog.
    The problem is that, time and again, studies of those claiming to be electrosensitive show their ability to determine whether they are being exposed to a real electric field or a sham one is no better than chance. So, unless they are lying about their symptoms, the cause of those symptoms needs to be sought elsewhere.
    Michael Landgrebe and Ulrich Frick, of the University of Regensburg, in Germany, think that the "elsewhere" in question is in the brain and, in a paper presented recently to the Royal Society in London, they describe an experiment which, they think, proves their point.
    Dr Landgrebe and Dr Frick used a body scanner called a functional magnetic-resonance imager to see how people’s brains react to two different kinds of stimulus. Thirty participants, half of whom described themselves as electrosensitive, were put in the imager and told that they would undergo a series of trials in which they would be exposed either to an active mobile phone or to a heating device called a thermode, whose temperature would be varied between the trials. The thermode was real. The mobile phone, however, was a dummy.
    The type of stimulus, be it the authentic heat source or the sham electromagnetic radiation, was announced before each exposure and the volunteers were asked to rate its unpleasantness on a five-point scale. In the case of heat, the two groups’ descriptions of their experiences were comparable. So, too, was their brain activity. However, when it came to the sham-phone exposure, only the electrosensitives described any sensations—which ranged from prickling to pain. Moreover, they showed neural activity to match.
    This suggests that electrosensitivity, rather than being a response to electromagnetic stimulus, is similar to well-known psychosomatic disorders such as some sorts of tinnitus and chronic pain. A psychosomatic disorder is one in which the symptoms are real, but are induced by cognitive functions such as attitudes, beliefs and expectations rather than by direct external stimuli.
    The paradoxical point of Dr Landgrebe’s and Dr Frick’s experiment is that mobile phones do indeed inflict real suffering on some unfortunate individuals. It is just that the electromagnetic radiation they emit has nothing whatsoever to do with it.
According to this passage, the experiment of Dr. Landgrebe and Dr. Frick
选项 A、has great scientific value.
B、proves mobile phones can cause cancer.
C、does not successfully prove the point of Dr. Landgrebe and Dr. Frick.
D、shows that those who claim to be electrosensitive are lying about their symptoms.
答案C
解析 推理判断题。本题可以采用排除法。文章没有涉及和体现“科学价值”的问题，故排除[A]；[B]既不是该实验的目的，也不是该实验的结论，选项内容与文中的实验无关，故排除；[D]并非该实验的结论，那些实验的参与者并没有就其症状说谎，因为那些症状是真实存在的。由此可知[C]正确，他们的实验存在自相矛盾的地方，并未成功地证明他们的观点。
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