填空题
A —domestic trade B —international trade
C —terms of trade D —free-trade area
E —importer F —exporter
G —commercial channels H —commercial transaction
I —middleman J —stocks
K —bulk sale L —retail trade
M —unfair competition N —dumping profit margin
O —registered trademark P —head office
Example：(D) 自由贸易区 (P) 总部