Which of the following observations about tariffs is true? 以下关于关税的观点哪一个是正确的?
A.
Tariffs are generally anti-producer and pro-consumer.关税通常是反生产者和亲消费者的。
B.
Export tariffs are used to raise revenue for the government.出口关税用于提高政府的收入。
C.
Export tariffs are far more common than import tariffs.出口关税比进口关税普遍得多。
D.
Import tariffs increase the overall efficiency of the world economy.进口关税提高了世界经济的整体效率。