单项选择题

基尼系数是指（）。 A.
不平等面积与平等面积的比率 B.
平等面积与不平等面积的比率 C.
不平等面积与完全不平等面积的比率 D.
完全不平等面积与不平等面积的比率

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A.脑膜瘤
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C.神经纤维瘤
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For a college student who wishes to calculate the true costs of going to college, the costs of room and board _______.
A、should be counted in full, regardless of the costs of eating and sleeping elsewhere
B、should be counted only to the extent that they are more expensive at college than elsewhere
C、usually exceed the opportunity cost of going to college
D、plus the cost of tuition, equals the opportunity cost of going to college