题目内容
（请给出正确答案）
A．18
B．36
C．38
D．45
E．50
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“A certain spiral staircase is designed so that each step after the first one is turned 20°”相关的问题
A、The Labour and The Liberal Party
B、The Conservative and The Liberal Party
C、The Labour and Conservative Party
A、pack
B、pad
C、cluster
D、squeeze
The Public Health System
One of the biggest changes since 1990 is the degree to which bioterrorism has become a public health priority.Although there had long been concern about vulnerability to biowarfare and bioterrorism the anthrax episode in the fall of 2001 made it clear that the concern is no longer theoretical.Until very recently, the important role of public health at the frontlines of bioterrorism preparedness was unrecognized.Although concern about emerging infections has helped stimulate funding for the chronically under-appreciated public health system, the threat of bioterrorism motivated the first real infusion of new money into public health in
decades.
Many of the capabilities needed to defend against bioterrorism are the same: as those needed to combat natural emerging infections.In both instance, the problem is an unexpected outbreak of infectious disease, of which the first indication is likely to be sick people in emergency rooms or clinics.Indeed, as with the anthrax attacks, the public health and medical responses may be under way before the true nature of the outbreak is recognized. Public health and the interface with the health care system are therefore key elements in any effective response to bioterrorism.
Whether the biggest threat is natural or engineered much remains to be done.Efforts to strengthen surveillance and response worldwide and to improve communication must be accelerated and sustained.Further,we have only scratched the surface in terms of understanding the ecology of infectious diseases and developing strategies for regulating microbial traffic.We need tools for better predictive epidemiologic modeling when a new infection first appears and for better analysis of the factors that transfer pathogens across species.One encouraging development is the program in the ecology of infections diseases that was started a few years ago be the National Science Foundation in cooperation with NIH.
SARS is a good yardstick of our progress during the past 13 years.The syndrome was unusual because novel infections that spread from person to person are relatively rare.Once cases were finally reported, the public health response was vigorous.WHO warned health care providers, researchers rapidly identified a candidate virus, and prototype diagnostic tests quickly became available.The vast reach of the Internet was instrumental in sharing formation and coordinating activities worldwide.Despite these advances, SARS had already spread to many countries.In fact had the disease been as transmissible as influenza, it would have invaded virtually every country in the world by the time the public health response had begun.So what SARS tells us is that although we have come long way since 1990, we still have a long way to go.
The main idea expressed in the first paragraph is that__________. 查看材料
A.the threat of bioterrorism is real rather than theoretical
B.the concern about bio-warfare and bioterrorism has been justified
C.the public health system plays an important role in fighting against bioterrorism
D.bioterrorism has to a considerable degree become a public health priority
| 听下面一段材料，回答第1至3题。 |
| 1. Where is the new airport？ |
[ ] |
| A. In the center of the city. B. Fifteen kilometers away from the city. C. Fifty kilometers away from the city. |
| 2. Why do many visitors come to the city？ |
[ ] |
| A. Because there are a lot of places of interest in the city. B. Because there is a new airport in the city. C. Because fewer accidents have happened in the city. |
| 3. When was the new airport built？ |
[ ] |
| A. Last year. B. Two years ago. C. Five years ago. |
A．n-4
B．n-3
C．n-1
D．n+2
E．n+5
警告：系统检测到您的账号存在安全风险
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
