A. the progression of globalization of economy B. the improvement of education in other countries C. the development of science and technology D. the flooding of foreign students 参考答案:A 答案解析:[定位] 题干中关键词challenge(挑战)与第二段第—…句chance(机遇)有些意义相通,定位此句。 [解析] 此段指出了global economy对美国学生带来的负面影响;经济的全球