题干

我国是一个多民族国家,各民族都为祖国的发展做出了重要贡献。阅读下列材料,回答问题。

材料一:这个事件以后,西域地区的葡萄、核桃、胡萝卜等传播到中原地区,为人们的日常饮食增添了更多的选择,丰富了中原人民的生活。……从此以后,西域各国纷纷归附汉朝,为此西汉政府专门设置机构总管西域事务。

材料二:

材料三:元朝的大统一结束了五代以来长期分裂割据的局面,基本上奠定了中华民族的版图,……也为中国此后六百多年的国家统一奠定了基石。

材料四:在清朝辽阔的疆土上,生活着汉、满、蒙、回、藏等诸多民族。清朝在边疆地区,分设机构,进行有效的管辖。清朝的统一,加强了各民族之间的经济文化联系,促进了边疆地区的开发,使我国统一多民族国家得到进一步巩固。

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    Norman Borlaug, who is making a difference, is known around the world. He is often described as the man who has saved more lives than any other person in history. Norman Borlaug is considered the father of what has been called the Green Revolution. His ideas about agriculture increased crop production and ended hunger in many nations. Mr. Borlaug continues to be a leader among agricultural researchers.

    Norman Borlaug was born in 1914 on a farm in the American state of Iowa. In the middle of the 20th century, world population was expanding faster than food production. Experts said many people in developing countries would face starvation.

    Norman Borlaug was an agricultural researcher at the International Maize and Wheat Improvement Center in Mexico. He developed methods of growing wheat that increased the amount harvested by three times. He later repeated this success in India, Pakistan and Africa.

    His methods of farming saved millions of people who would have starved to death. Norman Borlaug was given the Nobel Peace Prize for his efforts in 1970.

    Norman Borlaug is still urging experts to think about the needs of people around the world. His latest concern is a disease in wheat called UG99. He says it has the power to destroy most of the wheat being grown around the world. He says reductions in agricultural programs have made it harder to take action against such threats.

    Mr. Borlaug's granddaughter Julie works at the center named after him at Texas A&M University in Dallas. She says his worry about food problems rises from the belief that hunger is unacceptable. She says Norman Borlaug still believes it is our responsibility as human beings to feed one another.