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问题 单项选择题

一位左侧颞下间隙脓肿引发多间隙感染的患者，已行经颞部及下颌下区切口的上、下贯通式切开引流术，流出大量脓性分泌物。此时，应选择的引流是（）

A.片状引流

B.细纱条引流

C.管状引流

D.负压引流

E.碘仿纱条引流

答案

参考答案：C

选择题

1947年人民解放战争揭开战略反攻的序幕的地区位于 [ ]

A．豫皖苏地区

B．豫陕边地区

C．鄂豫皖三省交界

D．湘鄂赣三省交界

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单项选择题

British cancer’ researchers have found that childhood leukaemia is caused by an infection and clusters of cases around industrial sites are the result of population mixing that increases exposure. The research published in the British Journal of Cancer backs up a 1988 theory that some as yet unidentified infection caused leukaemia--not the environmental factors widely blamed for the disease.

"Childhood leukaemia appears to be an unusual result of a common infection," said Sir Richard Doll, an internationally-known cancer expert who first linked tobacco with lung cancer in 1950. "A virus is the most likely explanation. You would get an increased risk of it if you Suddenly put a lot of people from large towns in a rural area, where you might have people who had not been exposed to the infection. " Doll was commenting on the new findings by researchers at Newcastle University, which focused on a cluster of leukaemia cases around the Sellafield nuclear reprocessing plant in Cumbria in northern England. Scientists have been trying to establish why there was more leukaemia in children around the Sellafield area, but have failed to establish a link with radiation or pollution. The Newcastle University research by Heather Dickinson and Louise Parker showed the cluster of cases could have been predicted because of the amount of population mixing going on in the area, as large numbers of construction workers and nuclear staff moved into a rural setting. "Our study shows that population mixing can account for the (Sellafield) leukaemia cluster and that all children, whether their parents are incomers or locals, are at a higher risk if they are born in an area of high population mixing," Dickinson said in a statement issued by the Cancer Research Campaign, which publishes the British Journal of Cancer.

Their paper adds crucial weight to the 1988 theory put forward by Leo Kinlen, a cancer epidemiologist at Oxford University, who said that exposure to a common unidentified infection through population mixing resulted in the disease.

Who first hinted at the possible cause of childhood leukaemia by infection（）

A. Leo Kinlen

B. Richard Doll

C. Louise Parker

D. Heather Dickinson
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