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  3. At five feet, it can warn of a tumor no bigger than a pinprick deep in the b

At five feet, it can warn of a tumor no bigger than a pinprick deep in the b

游客2024-06-08  11
问题     At five feet, it can warn of a tumor no bigger than a pinprick deep in the breast. It can scan the wall of a fiery industrial furnace and indicate dangerous weak spots. It can examine a human leg and show a malfunctioning blood vessel that is causing varicose veins. Incredibly, it can even take a photograph of a past event.
    This remarkable technique is called thermography, and it has given human beings a new way of seeing. Thermography depends upon the fact that all objects give off infrared energy. The strength of these infrared emissions depends on the temperature of the body from which they come.  Although scientists have long been able to measure the strength of infrared emissions, the problem was to turn these measurements into some sort of "picture".
    Attempts were not notably successful until 1965, when Dr. Ray Lawson, of Montreal, made the first thermograms of the human body. Progress in the science has been rapid ever since, as industrial companies in Europe and the United States have come up with new developments.
    Today’s thermography looks, for the most part, like a small television camera. You point it at the subject, make a few fairly simple adjustments-and on an accompanying screen appear a black-and-white heat picture of the subject. Normally the warm areas are light, the cold areas dark, and the picture looks something like an ordinary photograph negative (底片). However, in some systems, black and white are reversed, and in still others the picture comes out in brilliant colors, with the various tones representing given temperatures.
    Using one of these systems, experimenters made a picture of the past. Focusing on an empty chair after someone had been sitting in it for a few minutes; they were able to see the heat pattern left by the body, still emanating from the chair’s fabric. The picture was so clear that they could detect that the sitter’s legs had been crossed.
    Thermography’s most valuable use has been in the field of medicine. Already it has helped to save lives, and added to doctors’ skills in treating disease. It has proved especially helpful in detecting breast tumors.
    The standard examinations for breast cancer are mammography (X ray of the breast) and clinical examination. But, says Dr. Harold Izard, of Albert Einstein Medical Center in Philadelphia, who has used thermography to examine some 20,000 women for breast cancer, "The two methods do not catch everything. Thermography can indicate the possibility of some small cancers that have been missed. And it’s safe and cheap. We can do a thermogram in a couple of minutes, and although the machines cost around $30,000 each, the price of operating them is a mater of pennies. And with the addition of thermography to the other two methods, we can get about 92 percent accuracy in detecting breast cancer." [br] What is the advantage in using thermography to detect cancer?
选项 A、It is very accurate in detecting breast cancer.
B、It can indicate very small cancers.
C、It adds to doctors’ skills in treating disease.
D、It is helpful to save lives.
答案 B
解析 问题是关于.. using thermography to detect cancer，因而选项C和D不正确。参见第6段的第2行：It has proved especially helpful in detecting breast tumors．(证明它在发现乳腺癌方面有特别作用)。原文中是“helpful”，而不是选项A所讲的“accurate”，因此，选项A不正确。参见文章中的最后1段的第4～5行：Thermography can indicate the possibility of some
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