In some cities it is very difficult to have a telephone_____. and people have to wait a long time before they can get a phone.
A. installed
B. validated
C. facilitated
D. assembled
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如果一个商品的边际效用为0，则发()。
A. 该商品没有效用，所以没人会消费它
B. 它的总效用达到最大
C. 消费者对该商品的购买是均衡购买量
D. 它的总效用也等于0
经济学中对于土地、资本和劳动的描述，以下()选项是正确的。
A. 数量是有限的，资源是稀缺的
B. 用来生产产出，属于生产要素的范畴
C. 决定这些资源产出的，是相关的技术含量
D. 以上选项都正确
从长期来看，一个国家的储蓄率提高，会使()。
A. 生产效率增长率和收入增长率提高
B. 仅仅使生产效率增长率提高
C. 仅仅使收入增长率提高
D. 生产效率增长率和收入效率增长率都没有提高
How did the "Wars of the Roses" get the name？
A. The wars were fought over the ownership of a rose garden.
B. The wars took place when roses were in bloom.
C. The wars were fought because of a love affair.
D. The two sides fought under banners depicting a white rose and a red rose.
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