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2015年职称英语考试理工类A级阅读判断巩固练习题18

发表时间：2014/6/4 10:15:39 来源：互联网点击关注微信：

Beyond the Pap

Scientists have known for some time that virtually all cases of cervical cancer are triggered by a family of viruses called human papillomavirus, or HPV. Most women who become ineffected with HPV are able to shake off the virus and suffer no apparent long-term consequences to their health. But a few women develop a persistent infection that can, for reasons that are not entirely clear, eventually lead to cancerous changes in the cervix.

Now researchers at the Digene Corp of Beltsville, Maryland, have developed a test that detects an active HPV infection by looking for its genetic byproducts in the vagina. The HPV test was better than the standard Pap test at finding cervical cancer at any stage, according to two studies published this month in the Journal of the American Medical Association. So far, so good. Unfortunately, the test's false-positive rate—how often it indicated that there was a problem when none existed was almost twice as high as that for the Pap smear. In these cases, a biopsy of the woman’s cervix showed no sign of disease.

And that’s the crux of the problem. How many women should undergo what is, when it comes right down to it, unnecessary treatment to find a few more cases of cervical cancer? Shouldn’t health officials focus instead on making sure that more women undergo regular Pap-smear examinations? After all, Pap smears, though far from perfect, have helped dramatically lower the death toll from cervical cancer taking it from the No. 1 cause of death due to cancer in American women to the 10th.

Complicating matters is the fact that HPV is a very common infection. In some parts of the U.S. as many as half of all women under age 35 have an active case. Yet 99 out of 100 women who are HPV-positive will never get cervical cancer, estimates Dr. Joanna Cain, vice president of the American College of Obstetricians and Gynecologists. “If those 99 women live their lives as if they’re going to develop cancer”, she says, “we’re not necessarily doing them any good.”

At present, the HPV test is approved in the U. S. only to help resolve ambiguous results from a Pap-Smear test. Many gynecologists believe that HPV will eventually replace the pap. But they’re not willing to abandon it without a lot more detailed information and neither should you.

词汇：

cervical 颈的；子宫颈的 trigger 发动，引起；促使

papillomavirus 乳头状瘤病毒 cancerous生癌的；患癌的；像癌的

cervix 器官的颈部 byproduct 附带产生的结果；副产品

vagina 阴道 Pap smear，Pap test 尼科拉乌试验，巴氏试验

smear（显微镜的）涂片；污迹，污斑；诽谤，诋毁

biopsy 活组织检查；（为检查和诊断而作的）活组织切除

obstetrician 产科医师 gynecologist 妇科学家

ambiguous 含糊不清的；不明确的；难以理解（或区分）的

注释：

1.Scientists have known for some time that virtually all cases of cervical cancer are triggered by a family of viruses called human papillomavirus, or HPV.一段时间以来，科学家们已经知道几乎所有子宫颈癌的病例都是由一组人类乳头状瘤病毒或HPV印发的。

2.Unfortunately, the test's false-positive rate—how often it indicated that there was a problem when none existed was almost twice as high as that for the Pap smear. 不幸的是，该检验的假阳性率，即其显示有问题而实际上并无问题的概率，几乎是巴氏涂片假阳性率的两倍。

3.How many women should undergo what is, when it comes right down to it, unnecessary treatment to find a few more cases of cervical cancer? 只是为了再多发现几例子宫颈癌病例，多少妇女应该接受那种说到底并不必要的治疗呢？

练习：

1. The cause of cervical cancer was discovered by American scientists some time ago.