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  3. Cancer is the second leading cause of death in the United States, after heart disease. In the past, it was often considered a de

Cancer is the second leading cause of death in the United States, after heart disease. In the past, it was often considered a de

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问题     Cancer is the second leading cause of death in the United States, after heart disease. In the past, it was often considered a death sentence. But many patients now live longer【C1】________ of improvements in discovery and treatment.
    Researchers say death【C2】________ 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【C3】________ .
    The National Cancer Institute and the Centers for Disease Control and Prevention studied the number of cancer survivors. A cancer survivor is defined【C4】________ anyone who has been found to have cancer. This would include current patients.
    The study covered the period from 1971 to 2001. The researchers found there are three【C5】________ as many cancer survivors today as there were thirty years ago. In 1971, the United States had about three million cancer survivors. Today there are about ten million.
    The study also found that 64% of adults with cancer can expect to still be【C6】________ in five years. Thirty years ago, the five-year survival rate was 50%. The government wants to【C7】________ the five-year survival rate to 70% by 2010.
    The risk of cancer increases with age. The report says the majority of survivors are 65 years and older.
    But it says medical improvements have also helped children with cancer live【C8】________ longer. Researchers say 80% of children with cancer will survive at least five years after the discovery. About 75% will survive at【C9】________ ten years. In the 1970s, the five-year survival rate for children was about 50%. In the 1960s, most children did not survive cancer. Researchers say they expect more improvements in cancer treatment in the future. In fact, they say traditional cancer-prevention programs are not enough anymore. They say public health programs should also aim to support the 60 numbers of cancer survivors and their families.
【C4】
选项 A、as
B、by
C、at
D、for
答案A
解析 这道题考的是固定搭配define as，表示“定义为”。
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