单项选择题
There is（）difference between tuition rates in public and private institutions of higher learning.
A.no B.significant C.some D.None of the above
单项选择题 Board of trustees is composed chiefly of laymen because（）
单项选择题 The universities that offer doctoral degrees are（）
单项选择题 Higher education in the United States consists of（）types of institutions.
