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【单选题】
Suppose Katie, Kendra, and Kristen each purchase a particular type of cell phone at a price of $80. Katie’s willingness to pay was $100, Kendras’s willingness to pay was $95, and Kristen's willingness to pay was $80. Which of the following statements is correct?A.
For the three individuals together, consumer surplus amounts to $35.
B.
Having bought the cell phone, Kristen is better off than she would have been had she not bought it.
C.
Had the price of the cell phone been $95 rather than $80, Katie and Kendra definitely would have been buyers and Kristen definitely would not have been a buyer.
D.
The fact that all three individuals paid $80 for the same type of cell phone indicates that each one placed the same value on that cell phone.
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皮皮学刷刷变学霸
举一反三
【单选题】题目: 设某人潮气量为500ml,无效腔容量为150ml,呼吸频率为12次/分钟,心输出量为5L/min,其通气/血流比值为 编号: CMAAQAC
A.
1.2
B.
0.6
C.
0.84
D.
1.8
E.
3.0
【简答题】免疫系统由免疫细胞和免疫分子组成。（ ）