NO.PZ2018062003000175
问题如下：
Which of the following statements is associated with the costs of international trade?
选项：
A. International trade may cause greater income inequality and the loss of jobs in importing country countries.
B. Countries may gain from exchange and specialization based on relative cost advantage.
C. Greater variety of products and services are available to households and firms.
解释：
A is correct.
Opponents of international trade point to the potential for greater income inequality and the loss of jobs as a result of import competition.Both B and C describe the benefits of the international trade.
考点：Benefits and Costs of International Trade
解析：国际贸易可能会造成进口国某行业大面积工人失业，继而产生收入不公平的问题。这是国际贸易的成本之一，选项A正确。
以较低的成本获得商品交换和专业化分工，这是国际贸易的好处而非成本，所以B选项错误。
获取大量品种的商品和服务也是国际贸易的好处，所以C选项错误。
不理解b有什么问题，b说的就是比较优势啊
