单项选择题

14岁男孩，跌跤后当晚自感全身不适，发热，左膝部疼痛，经用青霉素3日无效来院。检查左股骨下端肿胀，有局限性深压痛，膝关节内有积液，活动障碍，潮红不著，体温39.5℃，白细胞计数18×109／L，中性90％，血沉80mm／h,诊断

A.化脓性膝关节炎
B.股骨下端化脓性骨髓炎
C.创伤性膝关节炎
D.股骨下端骨肉瘤
E.风湿性膝关节炎
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Let us consider what science and technology have to contribute to the food problem.The simplest way to increase food production, one might suppose, is to bring more land【B1】cultivation and put more people to work on it. Some of the underdeveloped countries have resorted to this【B2】approach, without notable success. It contains several fallacies. For one thing, it usually means【B3】into marginal lands where the soil and climatic conditions give a poor【B4】. Cultivation may quickly deplete this soil,【B5】it for pasture or forest growth. It is often possible, of course, to turn such lands into useful farms by agricultural【B6】; for instance, a sophisticated knowledge of how to use the available water【B7】an irrigation system may reclaim semi-arid grasslands for crop-growing. But the cultivation of marginal lands is in any case unsuccessful【B8】it is carried out by farmers with a centuries-old tradition of experience or by modern experts with a detailed knowledge of the【B94】conditions and the varieties of crops that are suitable for those conditions. Such knowledge is【B10】absent in the underdeveloped countries.【B11】, we know that highly developed countries have not increased the【B12】of acres under cultivation,【B13】on the contrary have【B14】their marginal lands and steadily reduced the proportion of the population engaged in fanning. Efficient fanning【B15】concentration on the most efficient lands, and it results in greater production with【B16】peoplE.The problem of the underdeveloped countries, then is to increase the【B17】of their farms and farmers. This would allow them to industrialize and to feed their people more adequately. It is not easy to【B18】, however. The farmers are conservative and resistant to change【B19】their methods of cultivation. The underdeveloped countries are greatly in need of studies and experiments to help them to【B20】modern agricultural methods to their own conditions.【B1】A.underB.ofC.byD.in
A.B.
C.
【B1】
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单项选择题
42岁男性，股骨下端疼痛，膝关节活动轻微受限。查体：股骨下端偏外侧局限性隆起，压痛。皮温略高。X片：股骨外侧髁可见偏心性生长的骨吸收病灶，皮质向外膨隆，变薄.无骨膜反应。诊断为
A.骨巨细胞瘤
B.嗜酸性肉芽肿
C.内生软骨瘤
D.骨囊肿
E.骨纤维异样增殖症
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