"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 mount 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 newcomers 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 being infection?
A.Leo Kinlen.
B.Richard Doll.
C.Louise Parker.
D.Heather Dickinson.
第2题
A、输入回路中有一专门测量引线电阻值的电路
B、引线颗数增多,使引线阻值降低
C、热电阻的引线位于桥路的两个桥臂,且其电流相等,故引线上所产生的压降相互抵消,第三颗线作为桥路信号引出线
D、其中一条引线为温度补偿电阻制成
第8题
A.两线制适用于引线不长,测温精度要求不高的场合
B.三线制可以减小引线电阻对测量结果的影响,在工业检测中应用最广
C.四线制可以减小引线电阻对测量结果的影响
D.采用三线制测量电桥时,引线电阻分别接入电桥的相对臂
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