问题
单项选择题
The reason why international trade is more costly is that a border typically imposes additional costs such as( )，time costs due to border delays and costs associated with country differences．
A．production
B．tariffs
C．capital
D．goods
答案
参考答案：B
解析： 关税(tariff)是由海关按国家制定的关税政策和公布实施的税法及进出口税则，对进出关境货物和物品纳税人征收的一种流转税。关税、办理过境手续所花的时间等因素导致国际贸易成本加大。