解析:定位到C段第2句:Over the past three decades the number of students leaving home each year to study abroad has grown at an annual rate of 3.9 percent, from 800,000 in 1975 to 2.5 million in 2004.
48. The enrollment of international students will have a positive impact on America rather than threaten its competitiveness.
解析:定位到I段第1句:Most Americans recognize that universities contribute to the nations well-being through their scientific research, but many fear that foreign students threaten American competitiveness by taking their knowledge and skills back home. They fail to grasp that welcoming foreign students to the United States has two important positive effects: first, the very best of them stay in the States andlike immigrants throughout historystrengthen the nation;
49. The way research is carried out in universities has changed as a result of globalization.
解析:定位到E段:Globalization is also reshaping the way research is done.
50. Of the newly hired professors in science and engineering in the United States, twenty percent come from foreign countries.
解析:定位到C段末句:In the United States, 20 percent of the newly hired professors in science and engineering are foreign-born, and in China many newly hired faculty members at the top research universities received their graduate education abroad.
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