51. A。细节事实理解题。见第1段第2-3句：... because many people don't (or can't) seek care. It is not unusual for a family earning less than two hundred dollars a year to spend a quarter of its income on malaria treatment, and what they often get no longer works. (多年来，有5亿多病例由这种病引起的，虽然确切的数字难以估计，) 因为许多人不去寻求（或不可能）医疗护理。这种情况对于一个年收入不到200美元的家庭并非不同寻常，因为要治疗疟疾病， 就花去年收入的四分之一，并且他们时常所得到的不再有效。 52. C。细节事实理解题。见第2段第3句：Malaria parasites live by eating the red blood cells they infect (感染) .疟疾寄生虫依靠吃他们感染的红血球生存。这说明疟疾病患者的红 血球受到感染。
53. D。细节事实理解题。这种疾病之所以广泛传播是因为它有一种自我防御和抵抗新药物的能力。见第2段倒数第3句：Malaria has five thousand genes, and its ability to change rapidly to defend itself and resist new drugs has made it nearly impossible to control.。 54. B。推理判断题。根据第3段倒数第2句：Successful alternatives that help prevent resistance are already available, but they have been in short supply and are very expensive. 一些成功的可供选择的化学药品在阻止疟疾的这种抵抗力方面已经出现效用，但是这些可供选
择的化学药品非常短缺，并且昂贵，因此大多数人不容易得到可供选择的治疗。 55. D。细节事实理解题。A项见第2段第1句：Malaria starts suddenly, with violent chills, which are soon followed by an intense fever and, often, headaches；B项见第1段第1句：... kills as many as three million people every year almost all of whom are under five, very poor, and African.；C项见第2段第3句：Malaria has five thousand genes, and its ability to change rapidly to defend itself and resist new drugs has made it nearly impossible to control.；又见第1段第2 句：... because many people don't (or can't) seek care.；D项没有提到。
Step 3 Homework and consolidation exercises
1. 《英语周报》高三海南专版第30,31期的专题复习内容。
2. 《英语周报》高三海南专版第33-34期的2013年高考英语模拟试题（六）-（七） 3. 2011年和2012年全国各地的英语高考试题中的阅读理解。
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