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The Environment in Perspective: Is Everything Getting Steadily Worse? Much of the discussion of environmental problems in the popular press leaves the reader with the impression that matters have been growing steadily worse, and that pollution is largely a product of the profit system and modern industrialization. There are environmental problems today that are both enormous and pressing, but in fact pollution is nothing new. Medieval cities were pestholes—the streets and rivers were littered with garbage and the air stank of rotting wastes. At the beginning of the eighteenth century, a German traveler reported that to get a view of London from the tower of St. Paul's, one had to get there very early in the morning 'before the air was full of coal smoke.' Since 1960 there has been progress in solving some pollution problems, much of it the result of concerted efforts to protect the environment. The quality of the air in most Canadian cities has improved. In Toronto, for example, the concentration of suspended particulates, or soot, in the air has fallen dramatically since 1962. To put this figure in perspective, it should be noted that the current health advisory level for the index is 32. At a level of 58, people with chronic respiratory diseases may be affected. At 100, even healthy people may be affected by prolonged conditions, and those with cardiac and respiratory diseases could suffer severe effects Recently in Toronto, the index has exceeded 32 on fewer than half a dozen days annually. Similar improvements have occurred elsewhere in Canada and in other industrialized countries. Even the famous, or rather infamous, 'fogs' of London are almost a thing of the past. There have been two high readings of particular note in the British capital in 1959 (when the index rose to 275 and there was a 10 percent increase over the normal number of deaths) and in 1962 (when the index rose to 575 and there was a 20 percent increase in mortality ). But more recently, London's, cleaner air has resulted in an astounding 50 percent increase in the number of hours of winter sunshine. In short, pollution problems are not a uniquely modem phenomenon, nor is every part of the environment deteriorating relentlessly. Environmental problems do not occur exclusively in capitalist economies. For example, in the People's Republic of China, coal soot from factory smokestacks in Beijing envelops the city in a thick black haze. Similarly, smoke from brown-coal furnaces pollutes the air almost everywhere in Eastern Europe. It has been estimated that a third of Poland's citizens live in areas of 'ecological disaster'. The citizens of Leipzig, a major industrial city in what was formerly East Germany, have a life expectancy a full six years shorter than the national average. However, we do not mean to suggest that all is well with the environment in market-oriented economies or that there is nothing more to do. While there have been some improvements, serious problems remain. Our world is now subject to a number of new pollutants, most of which are far more dangerous than those we have reduced, even though they may be less visible and less malodorous While environmental problems are neither new nor confined only to capitalist, industrialized economies, these facts are not legitimate grounds for complacency. The potential damage that we are inflicting on ourselves and on our surroundings is very real and very substantial.
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【单选题】在何种情况下氯丙嗪的降温作用最强
A.
阿司匹林加氯丙嗪
B.
加氯丙嗪
C.
苯巴比妥加氯丙嗪
D.
异丙嗪加氯丙嗪
E.
物理降温加氯丙嗪
【简答题】Segment 2 What was the plan? I do not know how long leave I shall get. I could get as little as 14 days and I may get as much as _1__ . I’m wondering how I shall tell you I’m in England. Probably it’s...
【简答题】(1)处于一定空间运动状态的电子在原子核外出现的概率密度分布可用________形象化描述。 (2)对于排布在2s轨道上的电子,不能确定的是________(填字母)。 a.电子所在的电子层 b.电子的自旋方向 c.电子云的形状 d.电子云的伸展方向 (3)O 2- 核外电子占有的原子轨道数目为 ________。
【简答题】碳及其化合物广泛存在于自然界中,回答下列问题: (1)处于一定空间运动状态的电子在原子核外出现的概率密度分布可用( ) 形象化描述。 在基态原子中,核外存在( ) 对自旋相反的电子。
【单选题】健康评估是护理程序中的
A.
首要环节
B.
次要环节
C.
相关环节
D.
最终环节
【简答题】Segment 1 When I was very young, I was (1)________ animation. But I found myself flowing more into (2)____, because I realized from my own temperament, the effort and time involved to make the thing a...
【简答题】外模式又称 A 或用户模式,对应于用户级。它是某个或某几个用户所看到的数据库的数据视图,是与某一应用有关的数据的逻辑表示。
【单选题】健康评估是护理程序中的是
A.
次要环节
B.
首要环节
C.
第三环节
D.
相关环节
E.
最终环节
【单选题】为了避免混淆,十六进制数在书写时常在后面加上字母().
A.
H
B.
O
C.
D
D.
B
【简答题】处于一定空间运动状态的电子在原子核外出现的概率密度分布可用 _____形象化描述。在基态 14 C 原子中,核外存在 _____对自旋相反的电子。
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