College completion rates for young blacks have increased substantially, but they are only about one-half the rate for young whites. In 1981, for example, 11.5 percent of blacks aged twenty-five to twenty-nine and 21.3 percent of whites in that age group had completed college.

　　Blacks continue to be substantially underrepresented in graduate and professional schools in the United States. During the early 1980s blacks comprised about 6 percent of students in graduate school and medical school and about 4 percent of all law school students. Blacks also received about 4 percent of all doctoral degrees, but over half of these degrees were conferred in one disciplineeducation. In general, since the cry of reverse discrimination was raised during the middle of the 1970s, black progress in higher education has been slowed and perhaps even reversed.

　　1.What is the main idea of the passage?

　　A. Desegregation of higher education produced many difficulties for historically black institutions.

　　B. The opening up of higher educational opportunities for blacks led to expanded opportunities for white students too.

　　C. Blacks have been historically repressed in graduate and professional schools in the United States.

　　D. Desegregation of higher education has brought more higher educational opportunities for black and white students alike.

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