首页
登录
职称英语
When a disease of epidemic proportions rips into the populace, scientists im
When a disease of epidemic proportions rips into the populace, scientists im
游客
2025-04-14
32
管理
问题
When a disease of epidemic proportions rips into the populace, scientists immediately get to work, trying to locate the source of the affliction and find ways to combat it. Oftentimes, success is achieved, as medical science is able to isolate the parasite, germ or cell that causes the problem and finds ways to effectively kill or contain it. In the most serious of cases, in which the entire population of a region or country may be at grave risk, it is deemed necessary to protect the entire population through vaccination, so as to safeguard lives and ensure that the disease will not spread.
The process of vaccination allows the patient’s body to develop immunity to the virus or disease so that, if it is encountered, one can fight it off naturally. To accomplish this, a small weak or dead strain of the disease is actually injected into the patient in a controlled environment, so that his body’s immune system can learn to fight the invader properly. Information on how to penetrate the disease’s defenses is transmitted to all elements of the patient’s immune system in a process that occurs naturally, in which genetic information is passed from cell to cell. This makes sure that, should the patient later come into contact with the real problem, his body is well equipped and trained to deal with it, having already done so before.
There are dangers inherent in the process, however. On occasion, even the weakened version of the disease contained in the vaccine proves too much for the body to handle, resulting in the immune system succumbing, and, therefore, the patient’s death. Such is the case of the smallpox vaccine, designed to eradicate the smallpox epidemic that nearly wiped out the entire Native American population and killed massive numbers of settlers. Approximately 1 in 10, 000 people who receives the vaccine contract the smallpox disease from the vaccine itself and dies from it. Thus, if the entire population of the United States were to receive the Smallpox Vaccine today, 3000 Americans would be left dead.
Fortunately, the smallpox virus was considered eradicated in the early 1970’s, ending the mandatory vaccination of all babies in America. In the event of a re-introduction of the disease, however, mandatory vaccinations may resume, resulting in more unexpected deaths from vaccination. The process, which is truly a blessing, may indeed hide some hidden cures. [br] The main purpose of the passage is to______.
选项
A、convince the reader that vaccines are not as safe as many think
B、educate the reader on how vaccines are used and some of their dangers
C、educate the reader on the circumstances that would necessitate widespread vaccinations
D、present the method by which vaccines are used through the case of the smallpox vaccine
答案
B
解析
写作目的题。本文的中心内容讲的是免疫系统可以得到特殊的训练以应对疾病的较弱形式,以及疫苗有时会存在一些危险。故答案为B。
转载请注明原文地址:http://tihaiku.com/zcyy/4037369.html
相关试题推荐
Scientistsaresearchingforwaystodestroynuclearweaponsinspace—tomak
Scientistsaresearchingforwaystodestroynuclearweaponsinspace—tomak
Scientistsaresearchingforwaystodestroynuclearweaponsinspace—tomak
Scientistsaresearchingforwaystodestroynuclearweaponsinspace—tomak
Themoretimescientistsspenddesigningcomputersthemoretheymarvelatt
Themoretimescientistsspenddesigningcomputersthemoretheymarvelatt
Themoretimescientistsspenddesigningcomputersthemoretheymarvelatt
Awayfromtheirprofession,scientistsareinherentlynomorehonestorethical
AIDSiscausinggreatpublicconcernbecausethe______fataldiseasehitsprimari
Malariaisaninfectiousparasiticdiseasethatcanbeeitheracuteorchronica
随机试题
Iwanttodiscusssomeideasabouthowwemanageunderground【B1】______.Ifw
Americansarepeopleobsessedwithchild-rearing.Intheirbooks,magazines,
Spaceisfilledwithradiantenergyandbeyondearth’satmospherethisenerg
试论述实施乡村振兴战略的目标任务
固定义齿连接体的横截面积不小于A.1mm B.2mm C.3mm D.4m
甲公司平价发行5年期的公司债券,债券票面利率为10%,每半年付息一次,到期一次偿
新课程学生评价改革的重点是什么?
以下关于现金预算与实际的差异分析说法错误的是()。A.总额差异的重要性小
大部分药物透过胎盘屏障的方式是A.胞吞胞吐 B.被动转运 C.易化扩散 D
试述布鲁纳的认知结构学习理论及其教育含义。
最新回复
(
0
)