职称英语短语模拟题

[职称英语的报考选择]职称英语的报考选择报考选择 1、综合类、理工类、卫生类考试如何选择？综合类文章可以考到理工类去，理工类可以考到卫生类和综合类。三类考试之间没有严格界限区分。国家在每...+阅读

职称英语短语模拟题

Beyond the Pap

Scientists he known for some time that virtually all cases of cervical cancer are triggered by a family of viruses called human papillomirus, or HPV. Most women who bee 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, he developed a test that detects an active HPV infection by looking for its geic 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 ratehow 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 womans cervix showed no sign of disease.

And thats the crux of the problem. How many women should undergo what is, when it es right down to it, unnecessary treatment to find a few more cases of cervical cancer? Shouldnt health officials focus instead on making sure that more women undergo regular Pap-smear examinations? After all, Pap smears, though far from perfect, he 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.

plicating matters is the fact that HPV is a very mon infection. In some parts of the U.S. as many as half of all women under age 35 he 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 theyre going to develop cancer, she says, were 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 theyre not willing to abandon it without a lot more detailed information and neither should you.

练习

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