Passage ThreeQuestions 11to 15are based on the following passage.I first became aware of the unemployment problem in 1928. At that time I had just come back from Burma, where unemployment was only a word, and I had gone to Burma when I was still a boy and the post-war boom was not quite over. When I first saw unemployed men at lost quarters, the thing that horrified and amazed me was to find that many of them were ashamed of being unemployed. I was very ignorant, but not so ignorant as to imagine that when the loss of foreign markets pushes two million men out of work, those two million are any more to blame than the people who draw blanks in the Calcutta Sweep. But at that time nobody cared to admit that unemployment was inevitable, because this meant admitting that it would probably continue. The middle classes were still talking about "lazy idle loafers on the dole" and saying that "these men could all find work if they wanted to," and naturally these opinions spread among the working class themselves. I remember the shock of astonishment it gave me when I first mingled with tramps and beggars, to find that a fair proportion, perhaps a quarter, of these beings whom I had been taught to regard as cynical parasites, were decent young miners and cotton workers who could not understand what was happening to them. They had been brought up to work, and behold! It seemed as if they were never going to have the chance of working again. In their circumstances it was inevitable, at first, that they should be haunted by a feeling of personal degradation. That was the attitude towards unemployment in those days: it was a disaster which happened to you as an individual and for which you were to blame.
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Passage FourQuestions 16to 20are based on the following passage.People who live and work in areas with elevated levels of ozone and other airborne pollutants appear to run an increased risk of lung cancer, US researchers report in the December issue of the journal Environmental Health Perspectives. The researchers, Dr Beeson of Texas University and colleagues studied more than 4,000 female and 2,000 male, white, nonsmoking volunteers from 1977 to 1992.At the start of the study, the volunteers filled out questionnaires about their occupations, their exercise patterns, diet and other lifestyle choices, and their family's health history. The Questionnaires also asked whether the volunteers had any respiratory symptoms, how many hours they spent outdoors, and where they lived and worked. The researchers updated this information in 1987 and again in 1992.Using air quality monitoring station data, Beeson and colleagues then determined the levels of particle soot, ozone or "smog", sulfur dioxide, and other pollutants that the volunteers were exposed to, given where they lived and worked. Over the course of the 15-year study, 20 of the women and 16 of the men were diagnosed with lung cancer.Analyzing the relationship between exposure to airborne pollutants and lung cancer risk, the researchers found that both men and women regularly exposed to levels of particle soot that were lower than the National Ambient Air Quality Standard of 50 microgram per meter cubed ran an increased risk of lung cancer. And both men and women exposed to elevated levels of sulfur dioxide ran an increased risk of lung cancer.In addition, men regularly exposed to ozone levels of 80 parts per billion (ppb) ran more than three times the risk of lung cancer as men exposed to lower levels. The Environmental Protection Agency (EPA) limit on ozone is 120 ppb, Beeson and colleagues report. Women, however, did not appear to run an increased risk of lung cancer if exposed to high levels of smog."This gender difference may be due to the males spending much more time outdoors than females," they write. "This was especially true for the summer when ozone levels are higher." The difference may also have been due to hormonal differences, they add. Some research findings also suggest that the female sex hormone estrogen may partly offset the consequences of exposure to high ozone levels."Our findings suggest that the current EPA standard of 120 ppb for ozone may not adequately protect the large portion of the US male population who live or work in communities where the current standard for ozone is frequently exceeded," Beeson and colleagues conclude. "More research with a larger number of incident cases of lung cancer is needed to better understand the observed gender difference in regard to ozone exposure as well as to better separate the independent effects of ozone, airborne particulate matter sulfur dioxide, and other airborne pollutants."
混凝土的强度主要包括()
A. 抗压强度
B. 抗拉强度
C. 抗弯强度(抗折强度)
D. 抗剪强度
某工地实验室做混凝土抗压强度的所有试块尺寸均为200mm x 200mmx 200mm, 经标准养护条件下28天取得了抗压强度值,问如何确定其强度等级?
A. 必须用标准立方体尺寸150mmX 150mmX 150mm重做
B. 取其所有小试块中的最大强度值
C. 可乘以尺寸换算系数0. 95
D. 可乘以尺寸换算系数1.05
普通混凝土的立方体抗压强度fcu与轴心抗压强度fcp之间的关系是( )
A. fcp>fcu
B. fcp C. fcp=fcu
D. 不一定