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第6部分：完形填空(第51~65题，每题1分，共15分) 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Rise in Number of Cancer Survivors Cancer is the second leading cause of death in the United States,after heart disease.In the (51),it was often considered a death sentence.But many patients now live longer(52)of improvements in discovery and treatment. Researchers say death(53)in the United States from all cancers combined have fallen for thirty years.Survival rates have increased for most of the top fifteen cancers in both men and women,and for cancers in(54). The National Cancer Institute and the Centers for Disease Control and Prevention studied the number of cancer survivors.A cancer survivor is defined(55)anyone who has been found to have cancer.This would include current patients. The study covered the period(56)1971 to 2001.The researchers found there are three(57)as many cancer survivors today as there were thirty years ago.In 1971,the United States had about three-million cancer(58).Today there are about ten-million. The study also found that 64% of adults with cancer can expect to still be(59)in five years.Thirty years ago,the five-year survival rate was 50%.The government wants to (60)the five-year survival rate to 70% by 2010. | 
