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【单选题】
Sally sharpens knives in her spare time for extra income. Buyers of her service are willing to pay $2.50 per knife for as many knives as Sally is willing to sharpen. On a particular day, she is willing to sharpen the first knife for $1.75, the second knife for $2.25, the third knife for $2.75, and the fourth knife for $3.25. Assume Sally is rational in deciding how many knives to sharpen. Her producer surplus isA.
$0.25.
B.
$0.50.
C.
$1.00.
D.
$1.75.
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举一反三
【单选题】下列关于工程建设单位的职责表述错误的是()。
A.
工程建设单位是执行基本建设投资计划并负责组织施工建设的单位
B.
特殊情况下，一个工程项目就是一个建设单位
C.
程建设单位的职责，必须按照国家有关法规政策，合理安排和使用水利建设资金，项目法人对资金的使用与管理负全面责任
D.
工程建设单位要落实勘察设计任务，提供基础资料，组织设计文件会审
【单选题】听力原文：W: How far do you live from the university, John? M: It takes about 25 minutes to drive. But during rush hour, it will take twice the time. How long does it take the man to drive from his house t...
A.
25 minutes.
B.
30 minutes.
C.
40 minutes.
D.
50 minutes.
【单选题】Every evening M r. King takes a _________ to his home .
A.
25 minutes’ walk
B.
25 minute’s walk
C.
25 minute walk
D.
25 minutes walk
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