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  3. [A] Although pain may be a horrible necessity, there is no doubt that humanity could cope with far less of the chronic sort. Un

[A] Although pain may be a horrible necessity, there is no doubt that humanity could cope with far less of the chronic sort. Un

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问题     [A]  Although pain may be a horrible necessity, there is no doubt that humanity could cope with far less of the chronic sort. Understanding how the mind, the body and people’s genes interact to cause pain should bring more relief.
    [B]   Such ideas are being explored with brain scans which suggest that even if a low level of pain is being sent to the brain, the signal can be turned up by the "mind" itself. Indeed, patients can even be tricked into feeling pain. In one experiment volunteers were given a powerful painkiller and subjected to a painful stimulus—which, because of the painkiller, they could not feel. Then they were told the drug had worn off (although it had not), and subsequently complained that the stimulus hurt. People can, therefore, feel pain simply because it is expected. They can fail to feel pain for exactly the same reasons, for example when they are given placebos (a substance containing no medication and given to reinforce a patient’s expectation to get well) or are distracted. But although pain may be subjective, that does not mean the final experience is controlled solely by the mind.
    [C]  This would also help explain why chronic pains such as lower-back pain and arthritis fail to respond well to traditional pain therapies. But now an entirely new kind of drug, called Tanezumab, has been developed. It is an antibody for a protein called nerve growth factor (NGF), which is vital for new nerve growth during development. NGF, it turns out, is also crucial in the regulation of the sensitisation of pain in chronic conditions. After an injury which involves tissue damage and inflammation, levels of NGF increase dramatically. NGF seems to be involved in transmitting the pain signal. As a consequence, blocking NGF reduces chronic pain.
    [D]  Pain, unfortunately, is a horrible necessity of life. It protects people by alerting them to things that might injure them. But some long-term pain has nothing to do with any obvious injury. One estimate suggests that one in six adults suffer from a "chronic pain" condition. Steve McMahon, a pain researcher at King’s College, London, says that if skin is damaged, for instance with a hot iron, an area of sensitivity develops around the outside of the burn where although untouched and undamaged by the iron the behaviour of the nerve fibres is disrupted. As a result, heightened sensitivity and abnormal pain sensations occur in the surrounding skin. Chronic pain, he says, may similarly be caused not by damage to the body, but because weak pain signals become amplified.
    [E]   A recent paper in Proceedings of the National Academy of Sciences has shown that genes play a role in detennining sensitivity to pain. One gene, known as SCN9A, codes for a protein that allows the channels along which nerve signals are transmitted to remain active for longer and thus transmit more pain signals. It seems likely that this protein will attract a great deal more analgesic research. Variations in SCN9A may also explain why some patients prefer different classes of painkillers.
    [F]   Most pain resolves promptly once the painful stimulus is removed and the body has healed, but sometimes pain persists despite removal of the stimulus and apparent healing of the body; and sometimes pain arises in the absence of any detectable stimulus, damage or pathology.
    [G]  Tanezumab must still complete the final stages of clinical trials before it can become a weapon for reducing human suffering. But unexpected pains do not always come from the body. According to Irene Tracey, a pain researcher at the University of Oxford, how pain is experienced also depends upon a person’s state of mind. If successive patients suffer the same burn, the extent to which it hurts will depend on whether one is anxious, depressed, happy or distracted.
    【D1】→【D2】→【D3】→【D4】→E→【D5】
【D2】
选项
答案C
解析 D末句“慢性疼痛……是细微痛觉放大的结果”与C首句“这可以解释传统镇痛疗法……结果不理想”互成因果关系：正因为慢性疼痛不一定是由身体受损导致，因此，传统的通过治疗受损部位治疗疼痛的方法自然不一定见效了。A干扰性较大，因为其首句复现了D首句中的horrible necessity，但A首句的内容却无法与D末句提到的有关慢性疼痛被放大的内容衔接。故本题选C。
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