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【简答题】
社会保障体系向工人征税并给老年人津贴。假设国会既增加税收又增加津贴。为了简单起见，假设国会宣布，这种增加只持续一年。 a．你认为这种变动会如何影响经济?(提示：考虑年轻人和老年人的边际消费倾向。) b．你的回答取决于各之间是否有利他主义的联系吗? The Social Security system levies a tax on workers and pays benefits to the elderly. Suppose that Congress increases both the tax and the benefits. For simplicity, assume that the Congress announces that the increases will last for one year only. a．How do you suppose this change would affect the economy? (Hint: Think about the marginal propensities to consume of the young and the old.) b．Does your answer depend on whether generations are altruistically linked?
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举一反三
【单选题】Topics for textbooks and conference books should be_______ to the experiences and interests of the students.
A.
relevant
B.
concentrated
C.
reliable
D.
based
【简答题】下列治疗外周血管痉挛性疾病的药物是( )
【简答题】根据梁的支撑情况，将梁进行分类，并简单说明。
【单选题】Why can’t the man copy the topics from the woman’s notes?
A.
Because the woman doesn’t want to lend him the notes.
B.
Because the woman didn’t write down all the topics.
C.
Because the woman never took notes.
D.
Because the woman remembers all the topics.
【简答题】塑性力学的简单问题,包括两类:一类是塑性区应力分布由应力方程和应力边界条件完全确定,因而不用使用非线性本构关系便能得到所求的应力未知量,比如厚壁筒受压问题。还有一类问题是(),即应力状态的六个分量重只有一个不为零的应力分量,此时本构关系简单,求解也简单,比如三杆桁架、圆杆扭转、弯曲梁等。
【单选题】Internet voting happens all the time, but usually it's confined to topics such as 'Who is the cutest east member of Party of Five?' Soon, however, people will be able to cast their ballot (选票) for Pre...
A.
The civic affair enthusiasts take it as a way to increase voter turnout.
B.
Some Internet lovers hope that Internet can change politics.
C.
Some people can make profit from developing software for online voting.
D.
An increasing number of states or cities are considering voting online to help promote Internet voting.
【判断题】The colon is long and divided into the ascending, transverse and descending colon（ ）
A.
正确
B.
错误
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