The researchers from the University of Utah and Columbia University medical schools found the virus in 27% of the 200 cancerous prostates they looked at. They say it was associated with more aggressive tumours and found in only 6% of non - cancerous prostates. The finding raises the prospect of one day producing a vaccine to protect against prostate cancer. This is the first report to link XMRV (Xenotropic murine leukaemia virus--related virus) to human cancers. XMRV is a retrovirus like HIV which works by inserting a copy of its own DNA into the chromosomes (染色体) of a cell they infect. When this occurs to a gene that regulates cell growth, it can disrupt the normal development of the cell. Dr Helen Rippon, Head of Research Management at The Prostate Cancer Charity, said the research was intriguing (吸引人的) but posed several key questions about the role the infection plays in prostate cancer. He said: " Around the world, extensive work is being undertaken to identify risk factors for prostate cancer which will enable treatments and tests for the disease to be refined. " "It is critically important to identify key triggers of prostate cancer to improve early detection of the disease in men with potentially life threatening prostate cancer. " XMRV is known to cause leukemia (白血病) and other tumours in animals. Dr Ila Singh, who led the study from the pathology department at the University of Utah, said: "We still don't know that this virus causes cancer in people, but that is an important question we are going to investigate. " Dr Chris Parker, Cancer Research UK' s prostate cancer expert at the Institute of Cancer Research said: "This exciting study raises the possibility that the virus might contribute to the development of some prostate cancers. " "In the future, if it turns out to he true, then we, could speculate about the possibility of vaccination to protect against prostate cancer, similar to the approach now used to prevent cervical cancer (子宫颈癌). /
单选题
What is XMRV?
【正确答案】
D
【答案解析】根据题干定位到第一段：The researchers from the University of Utah and Columbia University medical schools found the virus in 27% of the 200 cancerous prostates they looked at. They say it was associated with more aggressive tumours, XMRV (Xenotropic murine leukaemia virus-related virus)(来自犹他州立大学和哥伦比亚大学医学院的研究人员发现，在200名前列腺癌患者中，他们发现27%的病人前列腺带有XMRV异嗜性小鼠白血病病毒相关病毒，研究者认为这种病毒和破坏力更大的肿瘤有一定关系)，可见选项D认为是一种在一些癌中发现的病毒是合文意的，故选择D。
单选题
How does the XMRV work to damage the human health?
【正确答案】
C
【答案解析】根据题干定位到第二段：XMRV is a retrovirus like HIV which works by inserting a copy of its own DNA into the chromosomes of a cell they infect. When this occurs to a gene that regulates cell growth, it can disrupt the normal development of the cell(XMRV是像艾滋病毒的逆转录病毒，它把自身的DNA复制品复制到健康细胞的染色体内。如果一个调节细胞生长的基因发生这种情况，就可以破坏细胞的正常发展)。可见打乱细胞发育是其破坏人体健康的方式，故应选择C。
单选题
Which one is NOT right about XMRV?
【正确答案】
C
【答案解析】文章第二段说：XMRV is a retrovims like HIV which works by inserting a copy of its own DNA into the chromosomes of a cell they infect(XMRV是像艾滋病毒的逆转录病毒，它把自身的DNA复制品复制到健康细胞的染色体内)和第五段说：XMRV is known to cause leukemia and other tumours in animals．(我们知道这种病毒可以再动物身上引起白血病和肿瘤)和we still don't know that this vires causes cancer in people(但现在还不知道是否能在人体内引起癌症)，可见选项C认为其可以在人体中引起癌症，是不合题意的，故选择C。
单选题
Why is it important to identify key triggers of prostate cancer?
【正确答案】
B
【答案解析】根据题干定位到第四段：It is critically important to identify key triggers of prostate cancer to improve early detection of the disease in men with potentially life threatening prostate cancer(至关重要的是，确定前列腺癌的主要诱发因素能大大提高早期发现男性前列腺癌的成功率)。可见选项B认为这对于早发现癌症是很重要的，是合文意的，故选择B。
单选题
What can be inferred from the passage?
【正确答案】
D
【答案解析】文章第一段说：The researchers from the University of Utah and Columbia University medical schools found the virus(来自犹他州大学和哥伦比亚大学医学院的研究人员发现XMRV病毒)；The finding raises the prospect of one day producing a vaccine to protect against orostate cancer, similar to the approach now used to prevent cervical cancer(这一发现使生产防止前列腺癌疫苗的前景更加明朗，使防止前列腺癌能和现在预防子宫颈癌一样)：this is the first report to link XMRV (Xenotropic morine leukaemia virus-related virus) to human cancers(这份报告第一次提出XMRV(异嗜性小鼠白血病病毒相关病毒)和人类癌症的联系)。可见选项D是不合文意的，故选择D。