农场养牛工，男，35岁。冬季某日翻倒未充分晒干而有霉变的干草，夜晚咳嗽、胸闷、气急、四肢酸痛、畏寒而就诊。查：体温37.2℃，白细胞总数和中性粒细胞百分比增高。听诊闻及两肺少许水泡音。X线胸片显示两肺点状阴影。本病最可能的诊断是（）
A.尘源性支气管炎
B.职业性变态反应性肺泡炎
C.棉尘病
D.石棉肺
E.职业性哮喘
参考答案：B
解析：本题病因是霉变的干草，提示了变态反应性疾患的可能性，再加上呼吸系统的临床表现，特别是X线胸片显示两肺点状阴影，由此可除外A、C、D、E，正确答案是B职业性变态反应性肺泡炎。
In the past, man did not have to think about the protection of his environment. There were not many people on earth, and natural resources seemed to be unlimited. Today, things are different. The world has become too crowded. We are using up our natural resources too quickly, and at the same time we are polluting our environment with dangerous chemicals. If we continue like this, human life on earth will not survive. Everyone realizes today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing methods, more and more fish are caught. We know that if too many trees are cut down, forests will disappear and nothing will grow on the land. Yet, we continue to use bigger and more powerful machines to cut down more and more trees. We realize that if rivers are polluted with waste products from factories, we will die. However, in most countries waste products are still put into rivers or into the sea, and there are few laws to stop this. We know, too, that if the population of the world continues to rise at the present rate, in a few years, there will not be enough food. What can we do to solve these problems? If we eat more vegetables and less meat, we will easily get more food. Land that is used to grow crops can feed five times more people than land where animals are kept. The world population will not rise so quickly if people use modern methods of birth control. Finally, if we educate people to think about the problems, we shall have a better and cleaner living place in the future.
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