问题 单项选择题

关于重链病的错误叙述()

A.血清电泳可见M蛋白区带

B.重链病一般无本-周蛋白尿

C.易反复感染

D.属一种良性病变

E.常见的是γ、α和μ型重链病

答案

参考答案:D

解析:重链病是由于浆细胞发生突变或异常增生,使血清和尿中出现大量游离的无免疫功能的免疫球蛋白重链,以γ、α、μ型为多见。血清电泳可以见到M蛋白区带。由于IgG的重链过剩,所以在γ型重链病时,一般无本-周蛋白。

问答题 论述题
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.

According to the passage, which of the following is true()

A. Most people believe childhood leukaemia is due to environmental factors

B. Population mixing best explains the cause of childhood leukaemia

C. Radiation has nothing to do with childhood leukaemia

D. Children born in a large town are at higher risk of leukaemia