问题
单项选择题
根据比较优势定律，应当生产某种特定产品的国家是由（）决定的。
a．机会成本
b．利润率
c．经济订货量
d．关税
答案
参考答案：A
解析：
各个国家各自的机会成本决定了它们将要生产哪种产品。选项(b)不正确，因为利润率并不影响该决策。选项(c)不正确，经济订货量决定了最优存货水平。选项(d)不正确，只有每个国家生产各自的产品时，关税才能发挥作用。
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根据比较优势定律，应当生产某种特定产品的国家是由（）决定的。
a．机会成本
b．利润率
c．经济订货量
d．关税
参考答案：A
解析：
各个国家各自的机会成本决定了它们将要生产哪种产品。选项(b)不正确，因为利润率并不影响该决策。选项(c)不正确，经济订货量决定了最优存货水平。选项(d)不正确，只有每个国家生产各自的产品时，关税才能发挥作用。
One day my math teacher asked me to help him save back-up copies of his work in the computer. I then realized I was able to 36 the grades for all of his classes. I showed him how to copy files from one disk to another and he 37 me. A few days later be asked me to help him again, because he 38 how to do it. when I began to show this to him, some students in my class 39 and began to talk among themselves 40 . Later that day, at lunch time, I was 41 by several of them. “Hey, could you help us change our grades in math? We’ll 42 you…” I could not believe what I was hearing．I could get paid for something very 43 ．" All right．I'll do it．" The next day my math teacher 44 me to help him out．When he was not paying attention, I began to change their grades from F's to A's． I soon became very 45 among my friends．They began to treat me like a god with a magical 46 ．I began to change the grades of students．Word 47 quickly and I became very rich． Everything was going fine 48 I was called into the headmaster's office．When I got there, my teacher was mad, and the headmaster had an angry 49 in his eyes． "I have known you for three years now．I don't want to 50 what your teacher said, but I'm afraid that I must．He has too much 51 , " he said．" Do you have anything to say 52 yourself?" he asked． "No．" I said finally．I did not realize how serious my actions had been．I had violated the 53 of my teacher, and the headmaster．And there was no way 54 ．I was forced to leave my school． That was a good 55 for me．
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