正确答案: D

Thus

题目：请在第_____处填上正确答案。

解析：最后一句是是对前文的一个总结和结果陈述，所以选thus，表示因此。still意为“仍然，尽管如此”，有转折的意味；however做连词意为“然而，但是”，是表示转折的常用连词；moreover意为“此外，而且”，表示更一步的说明或者补充。因此本题选D。

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学习资料的答案和解析：

[单选题]From the text we learn that__________.

阅读材料，回答下面的题目。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 indecades.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__________.

bioterrorism is an engineered threat to human beings

解析：【答案】A【解析】从原文第三段第一句话：“Whether the biggest threat is natural or engineered，much remains to be done”看出，bioterrorism是engineered，所以A对。B选项错在“can be arrested”上。原文是说能够减轻，但不能制止。C说自然的和恐怖主义性质的传染病是同一种性质的，显然不对，因为一个是natural，一个是engineered。D项同样不对。

[单选题]

回答下面的题目:The American FamilyIn the American family the husband and wife usually share important decision making. When the children are old enough, they take part_________(51). Foreigners are often surprised by the permissiveness of American parents. The old rule that "children should be seen and not heard" is rarely_________(52), and children are often allowed to do what they wish without strict parental_________(53). The father seldom expects his children to obey him_________(54) question, and children are encouraged to be independent_________(55) an early age. Some people believe that American parents carry this freedom_________(56) far. Others think that a strong father image would not_________(57) the American values of equality and independence. Because Americans emphasize the importance of independence, young people are expected to break_________(58) their parental families by the time they have_________(59) their late teens or early twenties. (60), not to do so is often regarded as a failure, a kind of weak dependence.This pattern of independence often results in serious_________(61) for the aging parents of a small family. The average American is expected to live(62) the age of 70. The job-retirement age is _________(63) 65. The children have left home, married, and_________(64) their own households. At least 20 percent of all people over 65 do not have enough retirement incomes. _________(65) the major problem of many elderly couples is not economic. They feel useless and lonely with neither an occupation nor a close family group.

for

[单选题]The name New England was given to the northern area ofNorth America by the boss of one of the two Virginia companies.

回答下面的题目：The First Settlement in North AmericaIt is very difficult to say just when colonization began. Thefirst hundred years after Christopher Columbus journey of discovery in 1492 didnot produce any settlement on the North America continent but rather someSpanish trading posts further south, a great interest in gold and adventure,and some colorful crimes in which the English had their part. John Cahot,originally from Genoa but a citizen of Venice, was established as a trader inBristol, England, when he made a journey in 1497. But his ship,the Matthew,with its crew of eighteen, did no more than see an island prohably off the NewEngland coast) and return home. He and his son made further voyages across thenorth Atlantic which enabled the English crown to claim a "legal"title to North AmericA．But for a long time afterwards the Europeans interestin America was mainly confined to the Spanish activities further south.The first beginning of permanent settlement in North America werenearly a hundred years after Columbus first voyage. The Englishman Sir WalterRaleigh claimed the whole of North America for England, calling it VirginiA．In1585 he sent a small group of people who landed in Roanoke Island,but theystayed only for a year and then went back to England with another expedition,led by Drake,in 1587. A second group who landed in 1587 had all disappearedwhen a further expedition arrived in 1590.The first permanent settlement in North America was in 1607.English capitalists founded two Virginia companies, a southern one based inLondon and a northern one based in Bristol. It was decided to give the name NewEngland to the northern areA．The first settlers in Virginia were little more thanwage slaves to the company. All were men and the experiment was not verysuccessful. Many dieD．Those who survived lived in miserable conditions. By1619 the colony had only a thousand people.We know for sure that colonization began at the end of the15th century,

Wrong 

[单选题]German people prefer extensive green roof systems to intensive ones.

回答下面的题目:Green Roof ResearchThe concept of green roofs is basically about growing plants on roofs, thus helping to replace the green footprint that had been destroyed due to the construction of the building. Green roofs are the most prevalent( 流行 ) in Germany, which is widely regarded as the leader in green roof research.The green roofs that are used these days can be classified as "extensive" and "intensive" systems. Extensive green roofs use mosses, grasses and herbs, which are tolerant to droughts. These plants do not need much maintenance, can be grown in a layer of substrate ( 土层 ) that can be as shallow as 1.5 inches, and generally are inaccessible to the public. In contrast, a wide range of species of plants are grown on intensive green roofs, such as shrubs ( 灌木 ) and even trees, which require deeper substrate layers, and are usually grown on flat roofs. They need intensive maintenance, and are usually areas that resemble parks which are accessible to people.There are several benefits of adopting green roof technologies. Apart from the obvious psychological and aesthetic (美学的 ) benefits of garden-like environments surrounding you, some of the common economic and ecological benefits are: a reduction in the consumption of energy; air and water purification; recovering green spaces; and the mitigation ( 缓解) of the heat island effect in urban areas.The green roof research that is currently ongoing is focused on evaluating the species of plants that are suitable to be grown on roofs, the methods of propagation ( 繁殖 ) as well as establishment, nutrient (养料 ) and water requirement, substrates, and the quantity and quality of water runoff. The evaluation criteria of plant species are: at what rate they can be established their capacity to withstand invasive weeds; tolerance of cold and heat; tolerance of drought conditions; capacity of persistence and survival.A number of experiments are being conducted on roof platform simulations at various research centers. These sites are generally outfitted with equipment, which are used to measure temperatures at different depths of the growing substrates, and the rate and volume of the runoff of stormwaters from each of the platforms.Green roof technology is representative of a completely new market for landscape contractors, and all roofs that currently exist and the future ones to be constructed are the potential market-a market that is too huge to be overlooked.It is estimated that around 10 percent of the flat roofs in Germany are green.

Not mentioned

解析：【解析】题意为：相比于“密集型”屋顶绿化，德国人更偏爱“粗放型”绿化模式。本文第二段解释了“extensive green roof”和“intensive green roof”的含义，但并没有提到德国人更偏爱extensive green roof。

[单选题]In the eighteenth century the heading of “natural philosophy” encompassed all of the sciences.

category

[单选题]A great deal has been done to remedy_ the situation.

improve      

解析：【题干】做了很多处理来补救这种情况。 【解析】考查动词。题干划线词remedy意为“补救”，所以正确答案为B。

[单选题]请在第_____处填上正确答案。

根据以下资料，回答下面的题目。 请在第_____处填上正确答案。

cost   

解析：at the moment接of，意为“在……时刻”；risk一般也与0f搭配，at risk of意为“冒……的风险”；at speed of意为“……的速度”。只有A项cost能与for搭配，at the cost for意为“以……为代价”，此句意思是城市密集的建设模式和选址常常以居民面临自然灾害为代价。所以本题选A。