An age cohort consists of people of similar ages who have similar experiences. （ ）

翻译： In the developing world, the large cohort of young people will also be dying off.

nconsistent with previous studies, our results from a large cohort of patients _____ this long-standing assumption.

In the Western world, that date will see the children of the “baby boomers” reaching the end of their lives. In the developing world, the large cohort of young people will also be dying off.

论点;“年龄差异从根本上比年龄群体(cohort)的影响更大”对“年龄群体的代沟效果主导年龄差异”。 

属于观察性研究的流行病学研究方法包括 A: 现况调查 B: 临床试验 C: 生态学研究 D: 现场试验 E: cohort study

动态生命表总结的是一组大约同时出生的个体从出生到死亡的命运,这样的一组个体称做____(cohort)

The difference in epidemiological experimental studies compared with prospective cohort studies is A: Research direction from outcome to causes B: Established a control group C: Interventions were implemented for the experimental group D: Can be used for cause inference E: Can be used to verify the cause of the hypothesis

Questions 7-10 :For each numbered situation below, select the most appropriate term from the following lettered options.Each option can be used once,more than once,or not at all. <br/>A study of antiviral agents is conducted for the treatment of assignments to individual patients are made by chance ( ) A: Cross-sectional study B: Cohort study C: Case-control study D: Experimental study E: Surveillance

Directions: In this section, you are going to read a passage with ten statements attached to it. Each statement contains information given in one of the paragraphs. Identify the paragraph from which the information is derived. You may choose a paragraph more than once. A) In the last decade, mainland Chinese students have reshaped the international student body at US colleges and universities, notably at Ivy League institutions. In the 2009-2010 academic year, China surpassed traditional "study abroad" heavyweights like Canada, India and South Korea, to lead international enrollment across US higher education, according to the Institute of International Education. The US-based institute's most recent figures reveal that mainland Chinese students increased 23% to more than 723,000 in the 2010-2011 academic year. B) While Chinese students traditionally went abroad when they failed to secure a place at a top-tier local university, the best students are now forgoing(放弃) famous Chinese universities to study in the United States. Many of them are seeking a higher quality of education that will train them to become independent and creative. And they believe the world's top-ranked universities are in the United States. While China's economic reforms and "opening-up" that began in 1978 gave rise to the first major generation of students who were generally reliant on scholarships to study in the United States, its rapid economic growth in the mid-1990s has made a distinctive second generation of overseas Chinese students emerge. This new generation comprises much more affluent students. Many of them don't rely on scholarships anymore. This is one of the reasons why there is such a great increase in this population. C)The factors driving mainland Chinese to study in the United States come into play much earlier. Starting around 2005, an influx(流入) of foreign Chinese students came into private US secondary schools. Many Chinese parents send their children to private US high schools as a strategic decision to strengthen their candidacy for elite(精英) US universities. A growing number also want their children to lead happier lives rather than have them consumed by preparing for the "gaokao" in China---the one-time, high-stakes national university entrance examination that is the sole determinant of admission. However, while US boarding schools desire Chinese students both for their dollars and diversity, they typically admit four to five students of any foreign nationality per grade level, with international students comprising up to 20% of the overall student body. With about 100 students for each of the four grade levels, this means admitting a maximum of 20 mainland Chinese, or five percent of the student body. D) By virtue of their size, US universities can accept a much higher number of Chinese students than boarding schools. Since 1999, China was the second leading place of origin for international students at Harvard, trailing only Canada. Its student numbers steadily increased to lead Harvard's international enrollment since the last academic year, with 686 students currently enrolled (nearly 16% of the international student body). China similarly dominates international enrollment at other Ivy League schools, including Yale and Princeton. International students are seen very favorably as a whole, as a way to diversify and really become a global institution. Also economically ---it's very advantageous for elite schools to admit international students because the bulk of them can pay full tuition. As such, there is "a lot of favoritism" toward such students, as financial aid budgets have been cut over the last decade. E) But while mainland Chinese students dominate international enrollment, they comprise a small fraction of the overall student body. This is even more the case at the undergraduate level, as most international students are graduates. According to Harvard spokesperson Kevin Galvin, Harvard has "no quotas or limits for international students. All students are considered in the same pool for all places in the incoming class, regardless of citizenship or the school they attend. " While there is no evidence of undergraduate quotas for international students in Harvard, it is standard practice for top-ranked schools to assess them as a separate pool rather than with the entire pool of applicants. Some US colleges and universities, however, state clearly that they aim to recruit an undergraduate group with around 10% international students. F) As US campuses cannot fully support the demand from China, some educators have seen an opportunity in bringing international education to China, beginning at the secondary level. The trend can already be seen in US universities establishing local degree-granting branches. Next September, New York University will welcome its first undergraduate cohort(一批人) at its new Shanghai campus. Instead of sending Chinese students to secondary schools in America or other foreign countries, these people want to bring international curriculum into China so they don't need to travel outside the country. They help local high schools incorporate international systems, such as the International Baccalaureate and A-Levels, alongside Chinese curriculum. Students at these "Chinese versions of international schools" are typically Chinese nationals, who are restricted by government policy from attending full-fledged(完备的) international schools, which cater to expatriates(侨民). ______1.Some American universities have already established local degree-granting branches in China. ______2.Though Chinese students lead international enrollment in many schools, they make up a small percentage of the overall student population. ______3.Many Chinese students start their study in America early at boarding schools. ______4.The number of mainland Chinese students in American colleges and universities has increased greatly in recent years, especially at Ivy League schools. ______5.American universities recruit international students as a way to diversify and improve their financial situation. ______6.American boarding schools usually admit a very limited number of Chinese students. ______7.Since the last academic year, China has become the leading place of origin for international students at Harvard. ______8.Many top students choose to go to American universities rather than attend the famous universities in China. ______9.Since US schools cannot fully satisfy the demand from China, educators now work to bring international education to China. ______10.Unlike the first generation of Chinese students in America, the new generation includes the best students and many of them do not need to rely on scholarships.