The scientists said they 61 their new technique in four different organs during rou-tine endoscopic cancer screening. The tip of the optical probe was brought into contact with the tissue to be tested and the scattering of light was recorded without the need for any tissue to be 62 , the scientists said. Our results show that light-scattering spectros-copy has the potential to detect pre-cancerous body damages and pre-invasive cancers throughout the body. This technique should 63 improve the efficiency of cancer screening and surveillance, the scientists said. Cancer is one of the biggest 64 in industrialized countries. 65 to figures from the World Health Organization, 10 million people were di-agnosed with the disease worldwide in 1997 and six million died.

　　51. A. stopping B. accelerating C. delaying D. detecting

　　52. A. with B. without C. throughout D. for

　　53. A, unless B. if C. whether D. whereas

　　54. A. capable B. possible C. impossible D. responsible

　　55. A. to B. at C. of D. for

　　56. A. when B. how C. why D. that

　　57. A. before B. after C. although D. near

　　58..A. described B. directed C. planned D. determined

　　59. A. contracted B. issued C. equipped D. coping

　　60. A. against B, with C. like D. for

　　61. A. had to test B. had tested C. have tested D. have been testing

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