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能部分代谢成吗啡，而产生成瘾性的药物是（）
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Short Answer QuestionsWe commonly think of sportsmanship in connection with athletic contests, but it also applies to individual out-door sports. Not everyone who picks up a fishing rod or goes out with a gun is a sportsman. The sportsman first of all obeys the fish and game laws, not because he is liable to be punished as a violator, but because he knows that in the main these laws are made for his best interests. The following are some of the things that those who would qualify for membership in the sports manship fiatrnity (圈内人) will do:1. Take no more game than the bag limit provided for by the fish and game laws. The person who comes back from a trip boasting about the large numbers of fish or game taken is not a sportsman but a game hog (贪得无厌的捕猎者).2. Observe the unwritten rules of fair play. This means shooting game birds only when the birds are "on the wing." For the same reason, do not use a shotgun to shoot a rabbit or similar animal while it is sitting or standing still.3. Be careful in removing illegal or undersized fish from the hook. This should be done only after wetting the hands. This is necessary because the body of the fish is covered with a thin, protective film which will stick to your dry hands. If the hands are dry when the fish is handled, the film is torn from the body of the fish. Without the protective film, the fish is more easily attacked by diseases. If you wish to release a fish that is hooked in such a way that it will be impossible to disengage the hook without badly injuring the fish, just take a knife and cut the line or leader as close to the hook as convenient. In a remarkably short time, the hook will break down and the fish will remain almost unharmed. Fish have been known to feed successfully while hooks were still in their lips.4. Be sure of the identity of your target before you shoot. Many useful and harmless species of wildlife are thoughtlessly killed by the uninformed person who is out with a gun to kill whatever flies within range A true sportsman will not shoot an animal which is not（）
病历摘要：男性，30岁。主诉：右视力下降1个半月，自觉右眼前有黑影，视物发暗变形，无眼红、眼痛史。三年前左眼曾有同样情况，经治疗约一年视力有恢复。最近患者工作紧张。检查：视力右4.6（0.4)，左4.9（0.8)。双外眼未见异常。屈光间质清晰。小瞳眼底检查：双眼视乳头正常，视网膜动脉稍细，静脉正常，右眼黄斑部稍隆起，有黄白色点状物，左眼黄斑部色素紊乱、中心凹光反射暗淡。 提示：本病预后好，视力恢复好，局部残留色素上皮萎缩或见脱色素斑。避免精神因素及过劳可以减少复发。 提问：本病目前最有效的治疗方法是（）。
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