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【单选题】
经济学家使用假设的目的是A.
使现实的世界更加容易理解
B.
使被构建的模型更准确地反应现实的世界
C.
使模型更加复杂
D.
使对现实世界的分析更加高深
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反馈参考答案：
举一反三
【单选题】Which of the following statements is true about 15-year and 30-year fixed-payment mortgages?
A.
Thirty-year mortgages are more popular than 15-year mortgages among homeowners who are refinancing.
B.
Borrowers pay more total interest over the life of a 15-year mortgage than on a 30-year loan, all else being equal.
C.
The remaining balance on a 30-year loan declines more quickly than an otherwise equivalent 15-year mortgage.
D.
Assuming they can afford the payments on both mortgages, borrowers usually should choose a 30-year mortgage over an otherwise identical 15-year loan if their discount rate (opportunity cost) exceeds the mortgage rate.
【单选题】( )是行车有关人员手持信号旗者直接用手臂显示的信号,用来表达相关的 含义,指示列车或者车辆的允许和禁止条件。
A.
固定信号
B.
手信号
C.
移动信号
D.
行车信号
【单选题】Who belongs to the motleyest part among the 30-year-old guys?
A.
30-year-old married guys.
B.
30-year-old divorced guys.
C.
30-year-old guys without a job.
D.
30-year-old single guys.
【简答题】铁路行车有关人员，接班前有何规定?
【单选题】Which likely has a longer duration - a 30-year 5% coupon bond or a 30-year 5% mortgage?
A.
The 30-year mortgage
B.
The 30-year bond
C.
Both have the same duration
D.
It is not possible to determine without more information
【单选题】Who belongs to the motliest part among the 30-year-old guys?
A.
30-year-old married guys.
B.
30-year-old divorced guys.
C.
30-year-old guys with a job.
D.
30-year-old single guys.
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