某消费者对某物之“最高愿付价”为100元，其以80元购得此物，请_爱下问搜题

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问题单项选择题

某消费者对某物之“最高愿付价”为100元，其以80元购得此物，请问以下观念何者有误？（）

A.此物全部都算是交易产生之“消费者福利”

B.消费者剩余为交易产生之社会福利之一部份

C.交易创造之消费者剩余为20

D.消费者剩余与消费者愿付价有关

答案

参考答案：A

改错题

此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画
一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正：
此行多一个词：把多余的词用斜线划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。
此行错一个词：在错的词下画一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。

    I received your letter was dated April 16th the day
before yesterday. All of our family greatly delighted to
learn how you are getting along very well with your lessons.
Time passes quickly. After dozens of days, you'll
finish the middle school. What pleases us most is that you
do very well to make up your mind to enter in the college
entrance examination this summer. What wonderful it is!
Dad, as well as Mom and I, is with you. We wished
you to make better use of your time. The full preparations
you make, the surer of success you'll certain be.

1.________
2.________
3.________
4.________
5.________
6.________
7.________
8.________
9.________
10.________

填空题

有A、B、C三种零件，分别为a个，300个，200个，采用分层抽样抽取一个容量为45的样本，其中C种零件抽取了10个，则此三种零件共有（）个。