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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. Which statement can be supported by Heather Dickinson and Louise Parker"s new findings
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水利部工程建设事故应急指挥部开展工作是在 的领导下。
For me, scientific knowledge is divided into mathematical sciences, natural sciences or sciences dealing with the natural world (physical and biological sciences), and sciences dealing with mankind (psychology, sociology, all the sciences of cultural achievements, every kind of historical knowledge). Apart from these sciences is philosophy, about which we will talk later. In the first place, all this is pure of theoretical knowledge, sought only for the purpose of understanding, in order to fulfill the need to understand what is intrinsic and consubstantial to man. What distinguishes man from animal is that he knows and needs to know. If man did not know that the world existed, and that the world was of a certain kind, that he was in the world and that he himself was of a certain kind, he wouldn"t be man. The technical aspects or applications of knowledge are equally necessary for man and are of the greatest importance because they also contribute to defining him as man and permit him to pursue a life increasingly more truly human. But even while enjoying the results of technical progress, he must defend the primacy and autonomy of pure knowledge. Knowledge sought directly for its practical applications will have immediate and foreseeable success, but not the kind of important result whose revolutionary scope is in large part unforeseen, except by the imagination of the Utopians. Let me recall a well-known example. If the Greek mathematicians had not applied themselves to the investigation of conic sections, zealously and without the least suspicion that it might someday be useful, it would not have been possible centuries later to navigate far from shore. The first man to study nature of electricity could not imagine that their experiments, carried on because of mere intellectual curiosity, would eventually lead to modern electrical technology, without which we can scarcely conceive of contemporary life. Pure knowledge is valuable for its own sake, because the human spirit cannot resign itself to ignorance. But, in addition, it is the foundation for practical results that would not have been reached if this knowledge had not been sought disinterestedly. The author does not include among the science the study of______.
It is often observed that the aged spend much time thinking and talking about their past lives, (1)_____ about the future. These reminiscences are not simply random or trivial memories, (2)_____ is their purpose merely to make conversation. The old person"s recollections of the past help to (3)_____ an identity that is becoming increasingly fragile: (4)_____ any role that brings respect or any goal that might provide (5)_____ to the future, the individual mentions their past as a reminder to listeners, that here was a life (6)_____ living. (7)_____, the memories form part of a continuing life (8)_____, in which the old person (9)_____ the events and experiences of the years gone by and (10)_____ on the overall meaning of his or her own almost completed life. As the life cycle (11)_____ to its close, the aged must also learn to accept the reality of their own impending death. (12)_____ this task is made difficult by the fact that death is almost a (13)_____ subject in the United States. The mere discussion of death is often regarded as (14)_____ As adults many of us find the topic frightening and are (15)_____ to think about it—and certainly not to talk about it (16)_____ the presence of someone who is dying. Death has achieved this taboo (17)_____ only in the modern industrial societies. There seems to be an important reason for our reluctance to (18)_____ the idea of death. It is the very fact that death remains (19)_____ our control; it is almost the only one of the natural processes (20)_____ is so.
水利水电工程施工企业管理人员必须经 安全生产考核，考核合格取得安全生产考核合格证书后，方可担任相应职务。
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