How about American higher education tuition 30 years ago?
A. The tuition was very high.
B. Most students were in debt
C. American higher education tuition was affordable and reasonable
D. American public colleges were free or almost free
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Nowadays, how about American higher education tuition?
A. The tuition was not high.
B. Most students were in debt
C. American higher education tuition was reasonable
D. American public colleges were free or almost free
In the following descriptions of present American social conditions, which one is NOT CORRECT?
A. Personal income increases.
B. Tuition costs rise.
C. Family income diminishes.
D. public funding declines.
以下关于“动态规模经济”说法正确的有（）。
A. 动态规模经济亦称学习效应
B. 指随着累积产量的增加，单位成本趋于下降的现象
C. 指随着产量的增加，平均成本趋于下降的现象
D. 来源于经验的积累，带来的效率的提高
动态规模经济与静态规模经济的区别在于（）。
A. 前者与时间有关， 后者与时间无关
B. 前者与时间无关， 后者与时间有关
C. 前者与单位成本有关，后者与平均成本有关
D. 前者与平均成本有关，后者与单位成本有关
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