Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.

A. contact    B. include   C. announced    D. public     E. especially

F. growing  G. leader   H. range      I. available  J. separately

Knowledge is free on the Internet at a small but __1.___ number of colleges and universities.

About 160 schools around the world now put free course materials on the web to the ___2.___. Recent additions in the United States ___3.___ projects at Yale,  Johns Hopkins and the University of California, Berkeley.

Berkeley said it would offer videos of lectures on YouTube. Free videos from other schools are ___4.___ at the Apple iTunes store.

The Massachusetts Institute of Technology (M.I.T.) became an early ___5.___with its Open Course Ware project, first ___6.___ in 2001. Free lecture notes, exams and other resources are published at ocw.mit.edu. Many exams even include the answers.

Today, Open Course Ware offers materials from 1,800 undergraduate and graduate courses. These  ___7.___ from physics to political science.

Visitors can learn the same things that M.I.T. students learn. But as the site points out, Open Course Ware is not a M.I.T. education. Visitors receive no credit toward a degree. Some materials from a course may not be available, and the site does not provide ___8.___ with teachers.

Still, M.I.T. says that the site has had forty million visits by thirty-one million visitors from almost every country. Sixty percent of the visitors are from outside the United States and Canada.

Students and educators use the site, including students at M.I.T. But the largest number of visitors, about half, are self-learners.

Some professors have become well-known around the world as a result of appearing online. Walter Lewin, a physics professor at M.I.T., is ___9.___ popular. Fans enjoy his entertaining lectures.

M.I.T. Open Course Ware now includes materials for high school. The aim is to improve education in science, technology, maths and engineering.

The world hash’t seen a pandemic（流行疾病）in 4 1 years，when the”Hong Kong”flu crossed the globe and killed about one million people worldwide．If H1N1 flu（甲型流感）reaches pandemic levels，what would happen next?
The outbreak of SARS in 2003 rang alarm bells as potential pandemics．Although it jumped the”animal-to·human”barrier，neither disease changed enough to enable human-to．Human infection．Strictly speaking，SARS did not become pandemics because it was too good at killing their hosts．For a pandemic，it needs to be able to maintain human-to．human contact without killing its host off．
”H1N1 flu is already a man-to-man disease，which makes it much more difficult to manage．
And H1N1 flu appears much more infectious than SARS．
But the WHO warns，it cannot say whether or not it will indeed cause a pandemic．According to experts，here’s what the world might see if there is another pandemic，based on past experience．
The disease would skip from city to city over an 18-to-24 month period，infecting more than a third of the population．World health Organization officials believe as many as 1．5 billion people around the globe would seek medical care and nearly 30 million would seek hospitalization．Based on the last pandemic and current world population，as many as 7 million people could die．Hospitals will become overcrowded；schools will close；businesses will close；airports will be empty．Business will become very bad，as people avoid as much social contact as possible．
Health facilities will become overrun with patients and there would be less-than-adequate staffing，as medical health professionals fall ill themselves and that would result in higher deaths．
The very young and very old will likely be the most susceptible（易受感染的）to the illness．Experts warn，much is still unknown about the current H1N1 flu virus and its severity and it is too early to say whether it will lead to a pandemic．Right now，the focus is on finding answers and controlling the spread．
【小题1】How many kinds of disease is mentioned in the passage?

A．The H1N1 flu will skip from city to city over an 18一to一24 month period．

B．Doctors and nurses will fall ill themselves，which will result in many more deaths．

C．Every country is taking measures to stop the H1N1 flu from leading to a pandemic．

D．The WHO and experts have known much about the current H1N1 flu virus．

THE 2,298-kiIometer Beijing-Guangzhou High-speed Railway 1.____ (official) opened to passengers on December 26，2012. It is the world’s longest high-speed rail route. The 2.____ (design)speed of the track is 350 km^, though speeds during the initial period of operation will be limited to about 300 km/h. The new route cuts the travel time between Beijing and Guangzhou3.almost two thirds, from 22 hours to roughly eight hours .On December 1, 2012，not long before the opening of the Beijing-Guangzhou High-speed Railway, the Harbin-Dalian High-speed Railway, 4.____ first high-speed line ever to cross land that lies frozen for almost half a year, began operations, 5.____ allows passengers to appreciate the view off the coast from Dalian in the morning, 6.____ the winter snowscape of frosty Harbin in the afternoon .At present the total 7.__ (long) of high-speed lines in China 8.___(reach)9,349 km. With four main lines 9.___ (run) east-west and four north-south, the country’s high-speed train network is the world’s largest. China plans to expand 10._ high-speed railway network to 50，000 km by 2020, to cover almost all large and medium-sized cities.

A. stable     B. solutions    C. considerable    D. role             E. included

F. task      G. compose     H. impact         I. challenges         J. certainly

With the world's population growing from six to nine billion by 2050, researchers, businesses and governments are already dealing with the ___1.___ this increase will have on everything from food and water to infrastructure (基础设施) and jobs. The demand for energy will keep growing, and is expected to double over the next 40 years.

Finding the resources to meet this demand in a ___2.___, sustainable way is the basis of our nation's energy security, and will be one of the major ___3.___of the 21st century. Alternative forms of energy- bio-fuels, wind and solar are ___4.____ being funded and developed, and will play a growing___5.___ in the world's energy supply. But experts say that even when combined, alternative energy sources will likely meet only about 30% of the world's energy needs by 2050.

For example, even with ___6.___ investments, such as the $93 million for wind energy development ___7.___ in the American Recovery and Reinvestment Act, important alternative energy sources such as wind and bio-fuels __8.___ only about 1% of the market today.

Energy and sustainability experts say the answer to our future energy needs will likely come from a lot of ___9.___ both traditional and alternative.