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职称英语卫生类考试考前每日一练 完形填空 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。 New Technique Promises Earlier Cancer Detection A new technique could revolutionize the early detection of cancer, giving sufferers a greater chance of beating the disease, American scientists said. Researchers at the Massa-chusetts Institute of Technology have devised a novel method of 51 changes in the nucle-us of cells in the earliest states of the disease. More than 85 percent of all cancers origi-nate in the epithelium that lines the internal surfaces of organs 52 the body. Al-though these are treatable 53 they are diagnosed in one of the preventable stages, early body damages are almost 54 to detect, said scientist Feld. We present a new optical-probe technique based on light-scattering spectroscopy that is a-ble 55 detect pre-cancerous and early cancerous cells in cell-rich epithelia, he added in a statement. The new technique relies on the fact 56 cell nuclei change in the early stages of can-cer and the differences scatter light in a characteristic way. Until now the changes were only de-tectable 57 a biopsy was taken, the scientists said. The new technique, 58 in the Sd-ence journal Nature , can be used in conjunction with a routine cancer screening and surveil-lance technique which uses an endoscope a flexible optical probe 59 with cam-eras which is inserted into a cavityin the bodyto check 60 cancers. | 
