91. ______ finding solutions, it is unthinkable to solve all the problems the same way throughout the country.

91. ______ finding solutions, it is unthinkable to solve all the problems the same way throughout the country.

  A. As if             B. As of         C. As for        D. As against

Cross-Cultural Solutions (CCS) is a non-profit organization founded in 1995, widely known as the leading organization in the field of international volunteering, with more than 4,000 volunteers each year. CCS has a worldwide staff（员工、团队） of more than 300 people, and operates in 12 countries, with administrative（行政的） offices also located in the United States, the United Kingdom, Canada, and Australia. It offers volunteer programmes in 12 countries in Africa, Asia, Eastern Europe and Latin America.
Cross-Cultural Solutions’ volunteer programmes in China are located in Xi’an,  the crossroads of Western and Eastern China, and the starting point of the Silk Road. Culturally, Xi’an is a mixture of the ancient and modern worlds. Home to the famous terracotta army, Xi’an was once the imperial capital of China. The city’s ancient history is embodied by the huge stone walls that surround the city centre, originally intended to protect the city from invasion. In the modern world, Xi’an is the largest capital city in Central and Western China. Today, with a population of approximately eight million, this modern city still reflects its rich history and culture.
China’s diverse population is well represented in Xi’an’s Han and other minorities. Volunteering in Xi’an will provide you with opportunities to connect with individuals from a variety of backgrounds, exposing you to the wide scope of Chinese culture, one of the largest and most ancient cultures in the world.
Through our cultural and learning activities in China, you will see the work of local artists, visit the site of the famous ancient terracotta（兵马俑） army, participate in weekly Chinese classes, and engage in lively discussions on Chinese culture and society. Activities may also include cooking classes or visits from experts in the practice of traditional Chinese medicine and a local painter skilled in the unique arts of Chinese painting and calligraphy(书法). Guest speakers may also cover topics such as Chinese folklore（民间传说,民俗;民俗学）and traditional Chinese music. Many volunteers choose to participate in regular visits to local universities to meet with students interested in English conversation and cultural exchange.
CCS offers the following programmes in Xi’an, China:
t Volunteer Abroad---- two to twelve weeks
t Intern Abroad---- three to four weeks
t Insight Abroad---- one week

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.