2. 职称英语
  3. Although no complete cure was ever found for people who had contracted the d

Although no complete cure was ever found for people who had contracted the d

游客2023-12-18  60
问题     Although no complete cure was ever found for people who had contracted the disease, a method of protecting people against catching it was discovered in 1796 by a doctor named Edward Jenner. He found that if he vaccinated people with the germs of a disease called cowpox (similar to smallpox but not nearly as dangerous), their bodies would develop an immunity which would prevent them from catching smallpox. This was a major step forward but did not lead to a dramatic decline in the spread of the disease throughout the world. Medical ideas spread slowly, communications were poor, the virus for vaccinations had to be developed carefully and there was resistance to the idea of vaccination. Even England, where vaccination had been discovered, suffered smallpox epidemics in 1893 and 1902. It was not until the 20th century that some countries began to overcome the disease by using improved vaccination viruses and better medical techniques. But then, as rapid air travel became possible, the problem worsened for travelers could swiftly carry the disease from country to country.
选项
答案    虽然没有为这种病人找到彻底的治疗方法，但在1796年，一位名叫艾德华?琴纳的医生却发现了一种能防止人们得这种病的方法。他发现，如果给人接种上一种叫牛痘的病菌(与天花相似，但几乎没有危险性)，人体便会产生免疫力，从而防止染上天花。这样就前进了一大步，但还不能使这种疾病在全世界的传播急剧下降。医学思想传播缓慢，交通不便，接种的病毒还有待精心的研究，同时对于接种牛痘的想法还存在着阻力。甚至在发现了接种牛痘的英国1893年和1902年也发生了天花流行。直到20世纪，某些国家利用经过改进的牛痘疫苗和更好的医疫技术才开始制服了这种疾病。但是后来，由于实现了高速度的空中旅行，问题趋于严重，因为旅客能把疾病迅速从一个国家带到另一个国家。
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3283430.html
相关试题推荐
随机试题
最新回复(0)