问题：
A . the careers unattractive to U. S. students may not be so to foreign students
B . science and engineering careers are unattractive exclusively to U．S．students
C . U．S．students age not courageous enough to face foreign competition
D . U．S．students are not well prepared to compete with foreign students
● 参考解析
【答案】A
【解析】在文章第二段中，“For the best and brightest from low-income countries，a position as a research assistant in the United States is attractive，whereas the best and brightest U．S．students might nOW see better options in other fields”可看出，A项与其意思相符，美国和其他国家的学生兴趣不同，而并不是美国学生没有勇气和没准备好去面对竞争，可排除c，D选项，而8项过于绝对。
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