
已知某一时期内某商品的需求函数为Qd=50-5P,供给函数为Qs=-10+5P。其他不变的情况下,由于生产技术水平提高则可能使得_____。
A. 需求函数变为Qd=60-5P B. 需求函数变为Qd=40-5P C. 供给函数变为Qs=-5+5P D. 供给函数变为Qs=-15+5P


A. 需求函数变为Qd=60-5P B. 需求函数变为Qd=40-5P C. 供给函数变为Qs=-5+5P D. 供给函数变为Qs=-15+5P
Listen to the talk again and complete the answers to the following questions.
1) What does the speaker try to tell us by citing the example of Thomas Edison?
It is a good example of .
2) According to the speaker, what kind of people will ultimately pull ahead and wind up on top?
They are the ones who make personal excellence a lifelong commitment. They keep , not becoming iscouraged by pitfalls or complacent by success.
3) According to the speaker, how do those people who finally succeed think about the pursuit of excellence?
They understand that the pursuit of excellence is a marathon , not a .
4) In sports jargon, what does persistence mean?
Persistence means , not tossing in the towel, refusing to quit.
5) According to the speaker, what often happens to the talented people who never seem to reach their potential?
These people often have , then seem to fade into oblivion.
6) According to the speaker, what will happen to people who are constantly changing careers?
They become enthusiastic about their new job and feed off the momentum for a while to perform well. But when this newness wears off and they realize they aren't incredibly committed to sticking to the job in the long term, their success and they start to fail.