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【单选题】
不属于遗传性红细胞内在缺陷的是A.
阵发性睡眠性血红蛋白尿症
B.
G-6-PD缺乏
C.
异常血红蛋白病
D.
遗传性球形红细胞增多症
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反馈参考答案：
举一反三
【单选题】If a substitute good is easy to find, then demand for a good is
A.
elastic.
B.
inelastic.
C.
unit elastic.
D.
perfectly inelastic.
E.
Substitutes don't have any effect on elasticity.
【单选题】The demand for a good is elastic if
A.
an increase in its price results in an increase in total revenue.
B.
a decrease in its price results in a decrease in total revenue.
C.
an increase in its price results in a decrease in total revenue.
D.
the good is a necessity.
参考解析：
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